For your level you should definitely study Najdorf , poisoned pawn variation especially the positions after 16...h5.And of course keep studying as many openings as you can.The more openings you know the better player you will be.
I would recommend the opposite: Leave openings for now and get better positional understanding.
When I first got into chess I looked up openings. From the sites I visited it seemed like the sicillian was the best. Now I am not sure because I am seeing SO many different openings. I only know the colle system, the sicillian defence (Sveshnikov, Hyper Accelerated Dragon, and the Normal Dragon), sort of the french defence, sort of the Nimzowitch defence (that GJ_Chess teaches on youtube), my anti-french exchange variation, the English, and sort of the Czech Defence. With the new V3 the opening is listed and I am like, what is a rat defence small center variation? Am I walking into a trap? Or is my opponent just stupid?
Back to the original question (that I have not listed yet in the article )
Which opining should I study? I am looking into the Modern Scandinavian (or the Qd3 variation), Sicillian (Sveshnikov, Hyper Accelerated Dragon, Normal Dragon, Nadjorf, Kan) and the French (I do not know any variation for the French).
I welcome all input and advice, thank you!