There are all sorts of paths. Knowing nothing about you I would council holding your powder. Put time into the kids and partner and keep the side hustles to hobbies/participating as a chicken (see Chicken vs Pig fable) at most in the community. Much much more important on any timescale for both your and their happiness and health to keep attention focused on them.
It can be very frustrating/challenging to the part of you that wants to do the startup to do this, of course- that frustration in itself is valuable experience. The reason so many have successful startups in their 40s and 50s is not because they tried and failed at startups in their 30s. They didn't, and instead found ways to improve their impulse regulation, decision making, relationship management- and their financial standing. Speaking very much from personal experience, so much about new ventures becomes easier when equipped with strengths in these areas.
It can be very frustrating/challenging to the part of you that wants to do the startup to do this, of course- that frustration in itself is valuable experience. The reason so many have successful startups in their 40s and 50s is not because they tried and failed at startups in their 30s. They didn't, and instead found ways to improve their impulse regulation, decision making, relationship management- and their financial standing. Speaking very much from personal experience, so much about new ventures becomes easier when equipped with strengths in these areas.
Manage the dopamine. Don't let it manage you.
Best wishes.