Over time, I’ve just found things to do with my time. I try project Euler problems and I’m pretty interested in meteorology. The rest of the time, I just participate in things my kids are interested in or involved in, though it’s not as easy as when I was young.
Routine is key, and being honestly and wholeheartedly engaged is key. You gotta do the time, don’t let the time do you.
This worked for me anyways.