My family became a lot more consistent after my facial surgery, and when electrolysis was mostly under control. Having a different face made a big difference.
After SRS (a little less than two years after coming out to them), I set boundaries. I made it very clear that going forward I wouldn't be able to tolerate misgendering. If they wanted to continue a relationship with me, they would have to be impeccable. So, immediately after a misgendering incident, I'd leave the house (or their company, if out in public) and the duration before coming back would get longer every time. This was extremely effective -- there were only 3 incidents in total after putting down these ground rules, and they were all over ten years ago now.
I had them remove all former pictures of me to storage. Only current pictures and references of me are allowed anywhere in the house.
We also practiced at storytelling. "When Sophie was a little girl, she liked to..." and so on. All the old anecdotes, retold correctly. It really helps. Also, they were not (and are still not) allowed to bring up the subject of transition.
Be very clear on what you need, and be prepared to enforce your boundaries. There must be negative consequences for any incidents. And, of course, positive reinforcement for being good -- like, spending more time with them, showing them more affection, doing sweet things for them, and so on. Likewise, you need to take into account what they need to help them along. If your mom says you need to participate in the women's rituals of the family (meal prep, emotional labor, etc.) then you participate.