Going to mastodon.social and searching for 5teverin0@pxlmo.com in the search field, I see posts going back to August 21 just fine from there. So it's not clear to me what is not working?
Federation of post is not retroactive - if you search up yourself from another instance you should find your profile, but you might not see your old posts. If you follow yourself, all future posts will be federated.