I don't have so much advice around this because around the time I heard about incels I looked at the subreddit and the thought occurred to me "if I want to have any relationship with a woman, of any kind, if I wanted to relate and communicate with them, then investing time with a group of people who self professed an inability to do so would be a waste of time.

And like I dodged a huge bullet. At the time I was in a college dorm and around a lot of men my age. It was a stark difference in how they viewed relationships with women. It was girlfriend or nothing to them. Friendship was failure. Zero interest. That really weirded me out. I didn't want to have that attitude.

And yeah it took me a while to fully learn good social habits, and there were missteps that I made along the way. But the basic concept of think and care about women as people and valuing friendship as it's own thing, not as a failure to date, really works to avoid falling into the hopeless rage of inceldom.