don't advance in leagues too far. currently league 30/29 (low cost for commons), league 24 (access to guilds), league 20 (access to dark tower), league 15 (for your alts), league 10 (unlock legendary chests from "pvp") are good stopping points. running into huge p2w wall in upper leagues can cause loss of interest in the game so enjoy the lower leagues as much as you can.
its nice having melee that can avoid being hit by enemy melee, and counters for fliers haven't been introduced to the game yet, so you'll have advantage for a while.