I’m not going to lie, the guildhall is pretty boring. There’s not much to it even after you upgrade it to max. So I was thinking, maybe there could be like guild banners available for guild fame (like the dyes in bazaars) and maybe have even further upgrades to the guildhall after the max stage. Some ideas I have so far are: add a fountain because they are cool, add so more interactive things other than just the shooting targets, and have it update with the nexus (summer, winter, fall, spring themes).
One final complaint I have about guild halls is that every time I want to change my character, I have to renter the nexus, then load into the guildhall again. I see no point in this, it really just annoys me a lot.