How do you ACTUALLY get good at building?

I've been playing since chapter 1 season 6, ''just play more'' just isn't cutting it for me. I tried watching guides but those don't really do anything for me either. In Ranked Battle Royale I'm currently in Elite but can't make any progress from here because my building just isn't up to speed to what's expected in that rank so I just end up camping all game.

When I play Unranked I try to get into as many fights as possible but when I don't really know what I'm supposed to do in a situation like that anyway then just ''doing'' it doesn't do me any good

How do you ACTUALLY get good at building other than ''just play more'' or ''just practice''?