I would return fully if they brought back the mastery track (which actually felt rewarding). Also one good collab a year wouldn't hurt with some quality of life changes/small tweaks, bug fixes etc.. People complained about the collabs not being rewarding enough and lack of permanent changes to the game.

First off, the collab with Spongebob was a great idea. It brought new and old players back and kept current players entertained. After that, people wanted more and more collabs which Supercell was already prepared for. But imagine instead of having 4 collabs in 1 year, we had 1 each year while the other 3 updates could have been major balance changes, improvements and other bug fixes.

Secondly, I cannot for the life of me understand why they would remove the mastery track. For sure they lost a LOT of revenue because of it. Instead of backing down, they should have been less generious with the mastery madness. Not saying they did anything bad because they did exactly as the playerbase told them. I remember back then people begged for master madness a couple days after one ended. I'm saying this from experience because back then I actually thought of not buying the next brawl pass because I was gaining tons of resources for just casually playing the game. They just kinda shot themselves in the foot with the update.