The best way to strengthen your inference making skills is practice. Most of the inferences as JY indicates are repeated throughout problem sets. If you keep practicing, you will start seeing the inferences repeat themselves over time and be more comfortable making them as time goes on. This is with exception to the Misc games. However, those ones are so odd and unique they end up being simpler than it initially seems.

Another thing that really helps me is mindset—these logic puzzles are not meant to be impossible. They are solvable. If something feels impossible, you are either missing an inference or reading something wrong.