Out of curiosity, is that cyl minus or plus? It matters quite a bit in terms of your spherical equivalence and how “wonky” your starting prescription is.
Are you sure your current optical prescription is accurate? You might want to get a second opinion from a different eye doctor who doesn’t have your prescription history to be sure. Also, given the complexity of your vision correction, you should consider investing in a trial lens set (aka test lens kit) and adjustable trial frame to be able to test your own eyes. It will be very helpful when trying out different lens configurations as you start trying to reduce complexity. Personally, I find my trial lens kit to be indispensable when it comes to reducing the amount of guesswork I have to do when ordering glasses (and answering “what if?” questions). This also saves money as I’m less likely to buy glasses that don’t feel or work right.
I am also in the group of people who have the trifecta of moderate to high myopia with astigmatism and a large diopter gap. Though your astigmatism power and diopter gap (both in sph and cyl) are a bit larger than mine, we’ll need to pursue a similar approach to get back to 20/20.
In my case, my plan is to start with a couple of rounds of binocular reductions once I start to see cm improvements, then focus on reducing astigmatism until that is gone (6-12 months), followed by 3-5 years of equalization cycles to reduce the diopter gap (with two binocular drops between cycles). By the end of all that, I should be in the 1.5 diopter range or so and can follow along with the rest of the “normal” low myopes and suffer through the last diopter hell.