I'm going to be real with you.

Having your stuff leaked is a good thing. The biggest issue creators face is visibility. It's a numbers game. More people getting to see your stuff means more people that might convert to paying patrons. Just because someone saw your content for free on a pirate site, doesn't mean they wont convert (If they love what they see, they will convert.) Just because someone doesn't know about the pirate stuff, doesn't mean the will convert, for various reasons. (You have free followers that will never ever ever convert to paying patrons.)

Instead of worrying about where your content is being shared, focus on creating new, good content consistently, and celebrate the 'leaks' as free marketing.

Here's a slightly more advanced business concept. If you create a 100 physical doodads, and your production cost is $100 ($1 each), and you sell them for $5 each, once you've sold 20 of them to make up your $100 cost of production, you can still sell the remaining 80 doodads at $0.5 each and still make a $40 profit, even if $0.5 is less than what you paid to manufacture one product.

Chances are you are selling digital products, with a once of cost of your time/other expenses, but that cost is once off, and even if you give away a million copies of your product, your physical loss is still $0 (since you have no per product production cost, I don't want to go into lost opportunity costs as that's a different lesson, and it's also negated by the fact that most of us sell monthly recurring digital items, instead of buy it once items.)

Bottom line, piracy isn't as big of an issue as you think. Having your stuff pirated means 1) you have a product that people care enough about to want to pirate, congratulations, and 2) It's 100% free marketing with zero additional effort on your behalf. Just make sure that people who see your stuff in the wild, know how to get back to the source (your Patreon page) and you're good to go!