A Top Laner Looking For Advice

So, I started playing this game around the beginning of season 7, I distinctly remember Xayah And Rakan being released not long after I began playing. I had played a lot of Dota before transitioning to LoL, and I thought I would be able to learn this game rather quick. Pretty obvious at this point, but that's not the case. My pinnacle of achievement in this game is reaching Gold 1 last season, spamming nothing but Gangplank top lane. I loved GP, mostly for his safe lane, global presence, and power farming ability. But, after maining him for so long, I've gotten tired of playing him so much.

It sounds silly, but i think i'm having trouble understanding how most traditional top laners actually win games. As of right now, I play mostly top, with some hints of tanks, and the occasional different bruiser, And i'm having an absolutely miserable time winning games. I've gone over my runes, general build, and strategies in lane with many other people who play top lane, and I still haven't improved as much as I'd like to. What i'd really like to know is: What is a bruiser's win condition? It certainly isn't anything i've been doing.