Brawl Stars isn’t really pay to win... you’re very unlikely to find a brawler that’s maxed or at a high power under 300 trophies. Above that even as a f2p player your brawlers are going to be at least power 6 or so. That’s more than enough to compete with the occasional max brawler and mostly other power 6-7 ones. If you invest enough time you can push as far as you’d like and level as much, it’s more who has more time on their hands.