First day - go to the nearest nightclub, head for the mosh pit
Go jump up and down to the beat in a mosh pit. Sure you're not targeting the skilled, but you'll get a ton of useful life skills. After a few big nights, you'll hopefully steal a set of skills that allow you to more efficiently steal skills:
Option 1. Sex work
Assuming you're non-lesbian female or non-straight male, able to mentally and physically do the work, and it's legal and safe in your location. You'll get a lot of very intimate contact with a wide range of people. Repeat clients are very common in that industry, and professional men looking for a few minutes of faux intimacy are a good market to exploit. If you're good at it (eg you stole the skills to appearing emotionally open and can easily "become their friend"), you'll get long bookings, allowing for the more complex skills to be absorbed.
Option 2 Tinder
Say you're not up for sex work for some reason (maybe you're a straight male?) in which case, hopefully you've learnt some skills on how to appear attractive, lead potential lovers on, and pick up anyone you want.
"What do you do for a living?" "I'm the city's only female structural engineer" "Ooh exciting I've never dated anyone in that field before! That sounds complex, I mean interesting!", "um, ok". Date them until you've learnt their skills, then move on.
Option 3. Adult events.
You've learnt a whole lot of skills from the thousands of people you were with in the mosh pit, some unmentionable, so put them to use. These events often attract people a little bit older than you'd like - which is good as it means they have more skills to give you.
Once you're "in" in that scene you can get referrals to other events (which you'll definitely need if an unaccompanied male), and start travelling the world of adult sex parties. Lots of close, intimate contact to steal even more skills.
Option 4 Taxi / uber driver
Say you don't want to use sex or love as a tool to pick up skills, you can use driving. Which is handy as from the mosh pit you've probably absorbed the ability to navigate every corner of your town in intricate detail.
Like sex work, but an extra 50cm between you (so a bit slower to absorb), but less police raids and you don't need a shower afterwards. You'll constantly be absorbing from various people. Do airport routes in a big city to get travelling professionals.
Just take long haul plane trips / bus rides over and over
You'll absorb everyone's skills in a few rows around you. Land, immediately fly somewhere else. Just keep flying over and over. Yeah it'll be a sucky life, living in economy class, but I don't think anything can beat it.
It's better to be in ecconomy than first class, or a flight attendant or pilot, as they don't get long, extremely close contact with as many people. The more BO you smell, the faster you're learning. In economy, you're touching two other people thigh-to-thigh for 20 hours, you have 6 more people within 75cm (3 row in front, 3 row behind), another 10 within 1.5m (6 in rows 2 in front, 2 behind, 2 out of 3 across the corridor, and the one in front or behind them). Within 5m on a particularly cheap airline (75cm seat pitch), you could be looking at 50 people.
Enrol in generic postgraduate study
Master of Business degrees are great because everyone in your class has a degree, and they're from a wide range of professions. By the time you get your MBA, you'll have everyone elses degree too!
Hospice ward night shift
The later in life you spend time with them, the more skills you get, right? So wait till they're at the end of their life, slowly dying under medical care, you can easily spend hours in the same room as them every night when nothing else is going on.
Spend the winter in Antartica
Research stations are wanting people for jobs at Antarctic research posts all the time. You're trapped for 12 weeks over winter in close contact with an expert in every field, as they need to be there for the full winter in case something breaks.
Volunteer at refugee aid organisations. Or join their caravans.
Who can afford to pay 10's of thousands of dollars to human traffickers to get crammed into a leaky boat for a chance to get to (for example) Australia? Rich, well educated families can. Illegal immigrants are often well educated. Eg 30% of American illegal immigrants have a college degree. When a coup happens and refugees flee, often the educated are the ones with both the motivation and the resources to flee. Spend a few weeks crammed in with all of them, and then maybe the overcrowded immigration centre if you're caught, you'll get all that education, and their language.
Just pay for tutors
Once you've got a skill that you can earn money from reliably and quickly (anything from sex work to performing arts to welding (which pays the most of any trade) to stock market manipulation), just start hiring tutors.
This also gives a paper trail to explain how you learnt something, just in case some government type tries to accuse you of, say, electrical work without an electricians training course.
Once you've learnt something, teach it
Aim to get hired by a university teaching (or even just tutoring in, to begin with). The goal is to hang out with all the professors in the uni faculty lunch room / staff training days.
You could also teach something like "Workplace sexual harassment training", or "workplace first aid", in which you have to spend time at a diverse number of workplaces interacting intimately with the staff. ("I need someone to demonstrate chest compressions on - what do you do?" "I'm the accountant", "uh I know that already, what about you?" "I'm an AI engineer" "Excellent come lie down here and let me talk at length about CPR while in close proximity to you").