Lets say that at least one alien is proven to exist, and it is roughly humanoid. It may have Klingon ridges on it's forehead, or blue skin, or have an extra set of limbs somewhere, but it's effectively humanoid in structure.
These alien are carbon based, can survive in our atmosphere with only limited, if any, life support systems. They reproduces sexually. Regardless of their culture their basic basic evolutionary psychology is at least roughly equivalent to our own, they like the same things, they pair bond in the same ways, they have a herd mentality and can't tolerate extend isolation. They conduct wars and institutionally nurture babies and are emotional and creative but can make logical facilities just the same ways humans do.
This species is 'relatively close' to us, on a astronomical perspective at least; close enough for us to one day theoretically have to worry about avoiding each others territory, because like us they value territory. They are also 'relatively close' on a technological level, sure they may have ray guns and ships that can travel at greater speeds, but their only a few centuries difference in tech, not millennial differences.
If more then two intelligent species exist then at least the majority of the ones we become aware of is humanoid.
Any scientist will tell you that the odds of this occurring is astronomically slim. However, humanoid aliens are more relatable then a strange methane based species that has limited sense of self or a crystal based species that never utilized sexual reproduction and has no sense of pare bonding or even traditional children.
So how does one justify the use of humanoid aliens, short of A wizard did it.
So far the only explanation I can think of is that all the species shared a common ancestor, but that requires hypothesizing an ape-like creature from earth was magically transplanted to another earth-like world it could survive on, in other words an unbelievably unlikely scenario is the closest to a believable scenario I can think of.
What other approaches may justify an alien species so similar to humans as to be relatable by them?
Edit: I should have made it clear. I'm presuming that the argument that "aliens just evolved like us because of convergent evolution" is invalid due to how astronomically unlikely I consider it is that a sapient, or even sentient, alien species would manage to follow such an exact path. I would accept convergent evolution combined with other approaches to justify why it occurred, for instance if a claim was made that many sapient species exist but we only find ones that are built like us because we only look for signs we associate with intelligence, which are all biased to presumption of species with similar evolution.
I wouldn't accept that as a sufficient explanation, but it does explain why we'd only run into humanoid aliens. Another possible explanation in that vein is that somehow, life is very common and the universe is just biased towards one kind.
The point is, I am looking for an answer that justifies humanoid creatures with presumption that evolution is not somehow per-programmed to be humanoid by default.