I've checked your account on usegalaxy.org and it looks like you've got one undeleted history with four undeleted datasets. Each dataset is around 30 GB large for a total of 120 GB which is about half of the 250 GB quota for registered users on main. So the quota seems to be correct - are you still having difficulty viewing the history?
Do you see all your deleted and undeleted histories when viewing the 'saved histories' page? The gear menu above the history panel -> Saved Histories -> Advanced Search -> status: all
As another (more catch-all) possible solution that may help make the rendering work again, you can try logging fully out and logging back in. This can clear saved UI data saved in the browser and sometimes helps.
Thanks for the additional info and let me know if I should clarify.