There's a great Firefox extension called LibRedirect[0] which can automatically redirect you to alternative frontends for many services.

[0] https://github.com/libredirect/libredirect

Nitter is a frontend for Twitter. It's so much faster, and doesn't block you if you don't have a Twitter account.

I don't use an alternative Web frontend for YouTube, but on Android I use NewPipe.

https://farside.link/ is a decent overview of the genre.

Libreddit!

And like sibling said, nitter.

Both are trivially easy to self host a private instance and with privacy redirect or a similar extension they just became my default way of opening twitter/reddit links.