Any Advice for Learning/Refining Social Skills?

Anybody have advice for learning or refining social skills? I'm an INTJ in my mid-20s and have recently hit a career milestone (all according to plan and ahead of schedule...excellent...), and have decided to spend some time working on my social life. Being a few years out of college, I realized my social skills aren't what they used to be, and certainly aren't adapted to life outside a dorm. Do any INTJs who've been down this road before have any advice for learning new social skills as an adult or refining latent social skills?

First time posting on this subreddit as well; links to any old relevant posts or threads are appreciated!