Hello. Maybe try to learn Gambits, not only for playing Gambits, just see how it works. Learn endgames, help improove your playing skills, and solve a chess puzzles.
Learn, learn, learn. If I was a 15 Years old Children have made it every day. Good luck! 
Dear chess.com community,
I have been playing online blitz for some years, and started in a chess club in the spring. After playing a match i analyze it with assistance from an engine. Sometimes there a big mistakes that can be "easily" understood and the motifs learned, but often i find that my games are quite solid (here meaning no big mistakes, but rather many small inaccuracies. and the positions seem to be quite dull), and so i find it harder to learn from my analysis. Should i simply just play "better" chess: Understand all the small inaccuracies. Or does it have more to do with the type of positions i create, positions that are not very tactical in nature.
As an example I recently played the following game that ended in a draw:
https://www.chess.com/analysis-board-editor?diagram_id=4594130
The game was played in a danish chess club match, i had the black pieces and both me and my opponent are rated around roughly 1600 rating. the time control was 1:30 hours, and an additional 30 minutes after 40 moves.
How could i have played differently to play for a win in that game, and perhaps in general.
Thanks a lot!