tl;dr what are all the ways I can block a website on linux? Debian if it's relevant.

I want to stop myself using certain sites. Since I'm reasonably techy and can work round all blocks I've come up with, I've found an effective approach is to apply as many hurdles as possible, so that visiting the website takes effort.

So far I've added the site to ublock's block list, and redirected sites via /etc/hosts. What other options are there?

While I have admin access to the router, I'm not allowed to block sites there.