Hello everyone, i would like some of you to recommend me fps games which have a big fanbase and are difficult

Great game potential. The base building needs more personality though. It's just soulless building and it takes ages when you get up into the teen levels. War Room to upgrade to lvl 15 takes nearly two days. Ridiculous. Also there needs to be more ways to earn characters. I'm doing ok without spending money so far (as I can't I'm not in the region it's officially out in) Just needs more polish and refinement and it should be good.