Grow pearls. Oysters take upwards of 7 years to grow pearls. Culture them.
A few other ideas:
Livestock are non-sentient. Raise chicks to a size ready to lay eggs or become meat. Reverse time on laying hens so they have a longer productive life.
Raise mammals to slaughter size or milking age. Reverse time on milking animals to allow them to "freshen" without having to give birth (in real life, a cow or other milk animal must birth every 1-2 years to keep her milk production going). Or speed up gestation.
Raise sheep and cashmere goats so they produce hair/wool quickly. Since lambswool is more valuable than regular wool, reverse time so that's what they always produce. Speed up the process so they need sheering every day instead of a couple times a year. Or set the timing so that all their hair growth is while they're being kept indoors very clean. Cleaning wool is a pain in the neck and it's hard to keep sheep that clean for months.
Make cheese. Very fancy cheeses need to age for a while but the real problem is figuring out the right methods to make them just so. You could cut down your research and development stage to days.
Cashmere goats are not common but their hair is quite valuable. You could also raise unusual sheep for their wool. Or other animals like camels.
Grow tulips. There was a tulip craze in Europe in the early 17th century. It got so bad that people went into debt just for a single bulb which they hoped to reproduce and make their fortune with. Needless to say, the market crashed and it was hellish. You could get ahold of some bulbs of tulips or other flowers and reproduce them. If your best bulbs die, reverse time and try again.
Grow other valuable plants and sell them or go to people's estates and speed up growth of their plants. For example, a wisteria vine can take up to 15 years before it blooms. Saguaro cactus take decades to be a reasonable size and to branch. In the modern world they can add tens of thousands of years to the value of a home. (Note that you never said where you lived in your world.)
Even microgreens can grow in minutes instead of days, then grow some out to seed to replant. If there's a market for them, you will dominate it.
If you want to get super fancy, create gemstones. These take special conditions, the ability to know where they will occur, and enough finesse that you don't screw up your world.