Perfect: you have pretty much the exact same style as me. In that case I’d very much recommend the Czech Benoni against d4 (hanging pawns has a good video on it). A very positional game plan with less theory and more ideas. Alternatively you could do the king’s Indian, which has much more theory. Against e4 I quite like the pirc (there’s videos on that by Rob Ramirez), which I can also give example games to see the style involved if desired. Finally, with white I really like the colle-zukertort system (Naroditsky and Ramirez have I think both covered it, though I came across it after having seen the colle in a book).

What all these have in common is that there’s relatively little theory required (with the pirc needing the most), and they’re more focussed on ideas – the pawn breaks each is going for, and where on the board you would like to draw focus. I’d be happy to play a couple of rapid games and talk though the ideas if desired (though I’m on lichess rather than chess.com).