14-1500 player


My approach, which has taken me from 700 last year to 1900 this year has been (and this might sound boring) sticking to one or two openings as white, and two openings as black (in response to e4, or d4).
As white, I learnt Ruy Lopez and Sicilian Najdorf as black I learnt Sicilian Najdorf and Nimzo Indian (to a limited extent) and if my opponent plays anything else, I’ll just respond by playing natural developing moves.
Your time and effort at your level is best spent on tactics and endgames in my opinion.