For voicing your opinion about activism,
I'd recommend to at least use:
- A burner account,
do not post your opinion through your daily account. - A paid, no-log VPN or Tor when posting.
Above should cover the needs of most people.
But if you think you're a high profile target,
then following would also be smart:
- Alter you writing,
do not post in similar writing as your main account, e.g. if you usually capitalize each sentence, don't, if you usually use emoji's, don't etc etc. - Use a privacy oriented OS to post on,
e.g. no Windows, no Apple, no closed source Android fork, but do use QubesOS, or TailsOS, or GrapheneOS. - Only use chat clients with E2EE (End to End Encryption) and without identifiers, e.g. SimpleX.