Slack doesn't let us search accounts by their IDs.

it's @U3LLD6Q78

Ah, but I can do it in exported user data. Although I'm not entirely sure how one can confirm whether it's indeed your account. It's way too easy for someone to change their name to timo and claim that some other timo account is theirs. But maybe you have an idea?

haha, no idea. maybe it has an email associated?

you could send an email, it should arrive in my inbox

It does have an email. But if you have access to it, how come you can't restore your access to the corresponding Slack account?

I don't know the email anymore

Ah, I'll DM it to you.