I think, if you want to improve, you should be:
- Playing often
- That's the most important thing. Once you are doing that, then try:
- Doing a bit of study of (a) openings, (b) tactics, and (c) endgames.
- I seem to remember there are some fine books about these things for juniors.
- Study can be reading books or doing puzzles or watching videos.
- Once you are studying as well as playing, then start:
- Writing down all your slow-play games (and others if you can), and then:
- Going over your games, (a) by yourself, (b) with another player, and/or (c) with a computer
- Checking your opening moves against a book or database - who made the last 'book' move
If you aren't doing any or all of those things, you won't improve as fast as you could.
We also have some advice about: