What are the steps required to start getting really good/go pro in a shooter.

The becoming really good part applies to me, going pro more out of interest.

I always liked shooters, played em since I was 8. Always liked more competitive games like Apex Fortnite or Valorant. Just now I got back into Apex again and I realized how much fun I am having playing it if I actually improve. Just hit Diamond and I want to keep on climbing, but I feel like I am at a point where "just playing more ranked games" won't quite do it for me.

I just got into uni and while that does consume a lot of time I saw that I can average 20 or more hours a week for gaming if I want to, so here is my question: what do pro players do that casual players don't in their routine? Assume I am adapting the mentality of wanting to go pro, how do I work on that then? And do I require a team for my ranked games? At what level is just playing solo not enough for improvement?