If they collapsed today, their friends in high places would get them a bailout... :-/
When I was shredding my original account, I used a Firefox extension - social book manager or some such. Took weeks. Added all nonsense personal details, added some bogus content.
That bogus content bit is hard, I should have done more of it before they locked my account.
If I was shredding a #facebook account today, I would seriously use this https://www.ayrshare.com/creating-social-media-posts-with-chatgpt-api/ to add bogus content in bulk, but it didn't exist when I was getting out of FB... :(
There is no deleting past content, really. But we can corrupt it! Scramble the signal!