1000+ in a year sounds manageable if you are willing to invest the extra work and study into your game.
For the opening stage of the game, chess opening principles is probably all you need at this level: https://www.chess.com/blog/KeSetoKaiba/opening-principles-again
For the middlegame (toughest part for most people), most will benefit from solving chess puzzles as it is likely the biggest return on investment for your time (because solving chess puzzles routinely develops "pattern recognition" and this is extremely valuable in chess).
For the endgame, you can learn the basic checkmates and basic theoretical endgames (such as Queen + King vs King checkmate, Rook + King vs King checkmate or King + pawn vs King endgame (usually a forced win for the side with the pawn) and recognizing which situations are a draw with best defense (such as a flank pawn when the enemy King can reach the promotion square in the corner first).
My YouTube channel also helps people improve at their chess, so you might like to check it out: https://www.youtube.com/@kesetokaiba6161/featured (KeSetoKaiba). Here is the Rook checkmate example I gave above just for an idea, but feel free to check out the other videos too 
Hello, i am 13 years old and obsessed with chess currently im 853 rapid, 602 blitz and 414 bullet, with rapid i would wanna break the 1 thousand mark in rapid but i cant really get past 900. can anyone help me set realistic goals and could give advice on how to reach these goals?