How to increase max stash size beyond 280 if I just started a few weeks ago?

So I have expanded up to 280 stash size now is there anything i can do to further increase stash size like participate in the expedition or something or is there nothing more i can do.

Just asking because what do most people do now with the extra coins after increasing stash size.

What are some things I can really do now besides I guess trader quests and maybe now I have to figure out how to max exp farm so i can max level my raider what are some tips maybe on that or other things to do.

For now my goal is to max level up my workshops but yeah after I do all that and trader quests and projects and expeditions/riven tides events etc I guess you just go into farm queens/matriarchs and pvp? maybe do feats for creds and coins and collect all the cosmetics.

I am just wondering what you guys found fun to pass the time after doing this.