I think you may have buried the lede here a bit. If your partner is not interested or invested in improving your sex life, the best tips and ideas aren’t going to mean much. This is something you have to both be working on together.

What does she say when you talk to her about this? Is she not interested in sex at all, or more that she’s fine with the status quo and you want more adventure/frequency?

Was it always like this? A recent change?