How can I use social media anonymously?

Let's say I live under an oppressive regime (don't we all?) How can I use social media anonymously, so I don't face reprisals from the government?

Mastodon, Lemmy, Reddit and other social media platforms restrict users who connect through TOR or a VPN.

Is there any way I can create an account on these services and use them anonymously?

Thanks in advance for any information and advice you can provide.