Aniconomics

I like the 100x premise to some extent but it needs good execution I.e, you need to find a talented individual or someone with unique abilities that you can gain for yourself. In anime terms, you needs to find a uchiha to bind to

The power progression is way too fast, I would understand if he decided to read an entire sects worth of tomes and combined all the information to create an ultimate cultivation technique. Then he uses his expanded divine sense to absorb all the cultivation knowledge from neighboring sects, further refining his ultimate technique. Which just spirals until it he absorbs all the cultivation knowledge on the continent

The government compelling people by law to register their private information and then uses that information to recruit them. Who would have guessed

This feels chinese, are you chinese author?

Overlord reference?

Its a good story. If stronger techniques have worse costs. Then the protagonist simply needs to get his hands on the most powerful techniques and eliminate their costs

It only mentions what someone is called if the contract is equal or if the night crawler has the advantage. Did you read it?

Amendment: Technically four restrictions since he can only gain abilities if the human opponent he kills is over eighteen. Which I did initially mention but did not include in the restrictions. Still not enough in my opinion, adding skill slots or skill merging would have been smart. The problem is that his continuous encounters with non-humans feels inorganic. Like if your reader is thinking "oh the author did this to slow downs the characters power progression" Then that indicates your story is not fully immersive. All the assassins that targeted him were conveniently non-humans. Which lessened the protagonists incentive to kill them and he instead recruits them. The shadow cultist who was leading the assassins was human but like I said, his vampire ally killed him instead. He barely killed like four cultists in his first encounter and they gave the protagonists all his core abilities. But for some reason, killing over one hundred in his third encounter doesn't even warrant a mention. Despite my complaining, I really like the story overall.

The premise is strange. His life was perfectly fine, all he had to do was put in a little effort. Look for a job, stay in contact with his friend. I think the framing needs to be changed. Some stories frame their protagonists as outcasts. Puzzle pieces that do not fit neatly within the framework of modern urban life. While Video games provide an escape that simulates combat and adventure. I don't think success is guaranteed is any reality just because you put effort into it. The premise would have also been more believable if he started at rock bottom. But the protagonist is given a bunch of advantages that makes it easier for him to grow stronger.

You twisted the premise by making the otherworlder the antagonist and a native the protagonist. The guy was essentially trying to min-max his build but he was willing to do all manner of unspeakable things to achieve it.