For some of them I kind of lost access so I would need to write emails to instagram or whatever, for others I would need to remember and to access to each one of them and delete them.
The hardest would be gmail with people having my contacts from like 10 years ago…
Instagram/Facebook I would just delete. Maybe make a final post explaining why you’re deleting and say “find me on Pixelfed” just to help spread the word.
For Reddit, I love when see people replace every comment they ever made with a link to Lemmy before deleting their account. Reddit shows comments from deleted accounts so they stay up. There are apps that will do this for you.
For Gmail just hold onto and have it forward to your new address in case someone tries to contact you that way. But also back it up with Google takeout in case Google randomly decides to delete the account (rare but it happens).