That is a massive database for 1 user. Even our Friendica that has over 1k users is half that size. Also a lot of Media storage I see. Likely you should prune the old media that is not even accessed anymore. Else you are caching all media and store it locally.
The biggest Mastodon instance we manage has 2 users, 1 has 23k followers. The database is 3.7GB and stored Media about 40GB,
