Multi-Account Containers to separate your tabs. Then wipe all cookies on closing.
Or if you want to be really fancy, you can just pick one of the Fantasy name generators: https://www.fantasynamegenerators.com/
Draknolf Frozen-Fur, a Nord from Skyrim has a nice ring to it.
This worked: Fluff Busting Purity
Although not certain how safe it actually is. Seems like the extension exists since 2009 and is still regularly updated. But it can not be found on Firefox native Addon database.
Even if you do not have a Facebook account, you are still being tracked through Ghost Profiles.
So no, you can not “just not use Meta”.
They are so ingrained in the internet, that you can not get away, no matter hard you try.
I mean, if you think everything is political, why are you on Non-politcal memes?
This community is not for you. Just block it.