I'm really worried that if Twitter becomes unusable that I won't be able to stay afloat financially.

My main source of income comes from newsletter subscriptions (https://www.readtpa.com), and Twitter has been the biggest driver of new free and paid sign ups.

I don't know what to do, to be honest.

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And I'm not alone in that. There are a lot of independent writers, journalists, content creators, etc., who have relied on Twitter to promote their work.and Twitter was already a difficult place to be. It wasn't some sort of bubble of positivity or lefty groupthink (as EM keeps trying to frame it), but now it seems like he's actively trying to push progressives off the platform.
It's why my most recent newsletter(my weekly recap) included to many links to other people's recently launched newsletters: I want to help as many people as possible.
Anyway, it's really difficult. There are no good options or answers for people in this position.
@parkermolloy People survive seismic shifts in industry regularly - unexpected factory closings / sudden bankruptcies / outsourcing / etc. It’s not fun, but it’s a good reminder to save 6 months salary for your emergency fund, and to spend time on some “what if” contingency plans in place when things are going well.
@JustinDerrick @parkermolloy and part of people surviving such calamities is people reaching out to each other, helping where we are able, providing a listening ear and banding together to suffer as a family of sorts. #Humankind #Together