InEnduringGrowStrong@sh.itjust.works

Speaking from experience?
That seems rough.

That was supposed to be ‘address’ as in email address, not sure how autocorrect figured that one.

Yes and no… say if you gave the email address lemmyworldthingy@sgarcnlsdomain.com when signin up and you start receiving garbage on it, you just delete the alias and move on.
The trick is that you can have several aliases go into the same inbox so you only have to check one place, but each thing is given its own IP making it easier to identify and filter culprits.

In your settings you should be able to choose a different theme.
darkly-red is what I use, I imagine it’s also available on lemmy.world.

Buying your own domain.
You can then use whatever provider, or host your email service… but at least you don’t need to change addresses when switching anymore.

The way deleted users is handled kinda sucks right now. I’d say… reach out to the spammy user’s home instance admin and have them delete that user’s content.

Also: Light therapy thing. Relatively cheap and easy, helps a lot with the moodiness of winter.