Some things to consider:
--A detailed evaluation by a much stronger player, going over a good number of your games and giving an opinion on areas of strength and weakness. This can help a lot to guide future self-study. If this isn't feasible, you'll need to try to do it for yourself. Usually we have weaknesses in areas we don't like to study, so if you don't do an evaluation, you'll continue to avoid your weak areas (they aren't fun) and get stuck.
--Books (or videos if that's better for you) that address your specific weaknesses.
I'd also mention that in my opinion tournaments are super fun and a good way to improve; there's no reason to avoid them until a certain rating. But you'll have to decide that for yourself.
I'm an unrated USCF/Fide player, but I would like to eventually be a NM (I'm probably 1600ish). I don't plan on entering tournaments till I'm 2000 standard and blitz on this site. I already have a chess board, but no chess books. I'm not interested in getting a chess.com membership. Chesstempo is great for tactics. Does anyone have any recommendations on what to buy in chess to help improve me as a player? (no chess steroids please)