Unfortunately, there is no cure for endometriosis right now. I hate having to write that sentence! However, there are several treatment options, some of which you may have already explored. Here is a good overview of the different kinds of treatment: https://endometriosis.net/treatment.
For me, the thing that has helped the most is excision surgery, but that isn't always accessible for everyone. Birth control never worked well for me, but some people find it helps a lot.