Can you win in competitive BJJ without playing a "Modern" game.

I like too keep my game pretty rooted in the fundamentals, I enjoy cross training in freestyle wrestling with my BJJ, I like too be on top position when ever possible, my knees are too shot for De La Riva to ever be a major technique for me and double guard pulling 50/50 battles bore me, I came from an MMA background and like to keep my grappling for the most part rooted in techniques that would be useful in a real fight.

Some would call this "old school BJJ" style, I dunno how I feel about that, I see nothing wrong with "new school techniques" but its just never going to be my game. I don't think there's anything wrong with wanting to train like this just like I don't see anything wrong with people who want to do Berimbolos all day everyday, that's the beauty of BJJ it can be what you want it to be.

But lately I am questioning whether its possible to have any success in competition without adopting this modern style of open guard game, especially in lighter weight categories like mine (featherweight). I love competing but I am getting a little deflated with it, do I need to move up a couple of weight classes to find some where my style will have more success ? do I just need to give up on IBJJF style comps all together ? does anyone know any good videos or instructional's on the theme of dealing with the modern berimbolo/de la riva game without having to make it your game ?