I just really wish the game had some PvE aspect that didn't give rewards - (boss fights?) - I really did like your idea about reward cards being exclusive to a season, the same way games like overwatch and league of legends have something only available short term.

New blood will only come when there's a compelling reason to play the game regularly.

The nature of a blockchain and a procedural system that the game is based on (ie not real time) - means that bots can likely be developed for any permutation or modification of game rules.

That's been the case right from the very start.