I have 2 kids under 2 and I am working on 2 startups at once. That is basically like having 4 babies. I don't believe you should necessarily wait for the right time, for any kind of baby. There may never be an ideal time. If you have something you are passionate about you go for it. If you don't then you bide your time.

I have gone through periods of burn out and extreme passion about my startups. Sometimes it's nice to have a steady paying job and be stress free for a while. That's you biding your time until the right idea/opportunity comes along.

I went through an acquihire myself. Don't feel bad, startups are a longshot, and to see any positive outcome is much better than nothing. I worked for that company for 2 years, became frustrated, had an idea I was excited about, and then started something new.

So my advice is, take the stress-free job until you build up the passion to work on something new. And then do it.

EDIT: typo