(disclaimer: I am definitely not on the shortlist for Mum of the year) However my Mum had serious mental health issues and was pretty broken as a person. When I had my own child I spent quite a lot of time reflecting on what I needed as a child that was absent. As a consequence, this is what I now try and do with my son.
Tell him regularly that he is loved. Especially during the bad times, when he is acting up. It's important he knows my love is not conditional on him succeeding or getting it right. I don't condone poor behaviour, and behaviour sanctions are applied. He knows what our boundaries are. But he doesn't have to think he has to be perfect to be deserving of our love. (Unlike my own childhood.)
Tell him I am proud of him. Not just for academic achievements, but for the little things he does that make a difference, showing resilience during a difficult time, putting effort in to try and achieve something challenging, showing kindness to others etc.
Turning up - trying as much as possible to be there for the sports days, school plays, swimming lessons etc.
Taking an interest in his interests. Which is challenging as he is ND and I spend a LOT of time listening to him vomit facts about trains and planes! But we go Trainspotting together. We go to transport museums. I have Flight Radar app and various other transport apps on my phone and I know the names of transport hubs around the world. He loves the fact that he can talk to me about what's important to him.
As I say, don't claim to be the perfect parent. Have plenty of bad days. But I can say with some confidence that my son is having a better childhood than I had.