It's been asked, but it didn't apply to me until now

I'll give you my TL;DR first. New store manager at a small company, want to avoid new manager mistakes. I also worked under two of the previous managers, who were both fired.

So.........I had a mid life career change moment and took a cashier job at my favorite store a little less than 2.5 years ago. Opportunities were there and I had a lot of service experience (and luck); I got a department manager position in 3 months, an assistant store manager position (at a different location) a year later, and now I am store manager (at my first location) a year after that.

Both of the previous managers were fired. I don't know why but I have guesses (burnout leading to poor decisions seems probable).

I love my company and although I feel a bit of an imposter rising through the ranks so fast, I do think I am qualified and I know I'm passionate, organized, and I love growing people and teams.

How do I not fuck it up?