Does anyone have any suggestions for where I should start regarding technique, repertoire, instruments etc?
A great teacher, a great work ethic, malleability, resilience, and a great attitude. Of course your question is very complex and unanswerable.
But, in a sense, I started over, too, at a point. Okay, I've been playing all my life, actually. Okay, I've started over a few times by some definitions. Okay, I've always loved it. Okay, I've had very little formal training. Okay, I've had HUGE setbacks. Okay, how do any of those things actually define me?
I don't think any of them form a point A leading to point B, I'll tell you that much. A little section of my own story? In 2008, I took a step out from under a rock, out from inside some abyss, faced some life-sized and seemingly insurmountable fears, and got on an airplane to go have a first lesson with my out-of-state teacher. 1 year later, the economy tumbled. 1 year after that, my husband lost his job of 12 years and shortly thereafter, I went to my first lesson with my in-state teacher. Okay, backup again, in 2008, when I stepped onto that airplane, I was just starting to learn some Grieg lyric pieces, a Chopin Prelude, and a Bach Prelude. In many ways I had stopped playing for a few years before that. In many ways I had never really begun. In many ways I had never been separated from the piano. I can tell you something, I had no clear idea on what in the world I was getting myself into.
3 years has been both Centuries and the flash of moments, all at once. Deserts, huge oceans, rough terrain, okay, some beautiful and sublime things, too. I'll tell you, I am so, so grateful to my teachers

. But, okay, it's impossible to tell this story, you know? Do I recommend explicitly to have a piano career? No. What I do recommend explicitly is to follow your heart and face your fears.