Former alcoholic, chronic self harmer, diagnosed BPD here:

I can only come from this from the perspective of what got me stable, so I cant really answer general inspiration live stuff. For me, it was a metric shit tonne of therapy, and some anti anxiety medication in the beginning of my "getting better" journey to help me tread water for long enough for the therapy etc to take effect. I quit drinking, which improved every single part of my life. I made a commitment to relentlessly call myself out on any toxic behaviour and work through those patterns with my therapist. I stayed away from relationships until I felt I was a version of myself that I was proud of.

Currently engaged, living in a nice 3bdrm home with my fiance and our dog, having a baby early next year. Consider myself recovering from alcohol because I believe it's a lifelong journey and you can't recover from BPD but by all accounts it has been completely stable for about two years now. I have already started reaching out to therapists and telling my OB that I am concerned about the post partum period, and I'm setting up additional therapy to support me around that time just in case my mental health takes a turn.

Maintaining stability and happiness is work, every day. You have to turn up for yourself and do the things that you maybe don't want to do but you know is good for you. For me that's things like regular exercise, stable eating patterns and endless communication with my partner. I am hyper aware that my life was a giant clusterfuck not too long ago, and the fear of going back keeps me really vigilant.