The only way to build a stable, long term income from the internet, is to own your audience. That means having the ability to always connect to your fans/followers/advocates/supporters no matter what happens.
No platform is safe from shutdowns, algorithm changes, policy updates, or self-inflicted stupidity. This is especially true if you're a NSFW creator.
So how can you protect your income no matter what happens to Patreon?
Backup your Patreon email list
The most reliable form of communication is good ole' boring email. Admittedly even email can be a fickle thing depending on inbox algorithms, but in terms or longevity and stability, having your supporters' email address cannot be beat.
One of the most underrated features of Patreon is that they provide you with your supporters' email addresses. This is true even for free members. You should ideally export your email addresses every once in a while to ensure you have a copy of your latest email list.
Want to make sure your latest patron emails are always backed up? Okoa automatically backs up your email addresses so you have an updated email list even if something happens to your Patreon account. Just export at any time from your account settings.
Have your own website for your content
Don't rely on Patreon to be the only organized place for your content. Parallel posting on your own website (ideal but more work) or other platforms (less work but also risky) is a necessity.
Diversify your income stream with multiple platforms
This goes hand in hand with backing up your content. Don't put all your eggs in the Patreon basket. It may be tempting to ignore less lucrative platforms like Subscribestar, but having those platforms as a back up can let you breathe easier in case one platform implodes.
Every creator niche has different parallel platforms. Look at similar creators to figure out what other platforms creators are using to diversify their income.
Do the smart thing: backup your Patreon email list regularly so that you can send out an email pushing users to a different platform if you need to.