Let’s say that Stripe won’t let you.
You can do this on the stripe side of things and click something that says something like “cancel when it expires”.
You can do that and then hope that your subscribers will
- notice that their subscription has expired
- figure out how to renew it
- not care that you’ve raised the price.
I think that if what you want to do is to make more money, then letting those subscriptions keep auto-renewing at the old price is going to yield lots more money than convincing them all to renew at a higher price. Knowing nothing about your community or product, I’d bet more people will auto-renew at $100 than would enter their credit card again to renew at $50.
Just create a new subscription at the new rate and hide the old one.