How to reach Tier 3 in Brawl Stars

This is a $50 method, but I'm giving it away for free here. While dual-wielding is the standard way to rank up, here's a trick: Transfer the brawler you want to rank up (must be Tier 1 or lower) to your second dual character after switching to the Zimbabwe server. Then, fill slots 1 and 3 with Level 11 brawlers under 1000 trophies. Brawl's matchmaking heavily considers the brawlers in slots 1 and 3, so this is how it's done. If you play like this, you'll face higher-ranked opponents within every 5-game interval (the standard interval is 5 games). Switch characters during those intervals. It works quite smoothly and effectively.