You may hate this answer: By doing things DIFFERENTLY.
What would you do if you didn't have children, but for whatever reason couldn't work?
This is a spin off of my "lottery" question. (AKA how I periodically reevaluate my life... if I won 50 kajillion dollars, after I'd given away everything I wanted to give away, bought everything I wanted to buy... WHAT IN THE WORLD would I do with myself??? One can only -from experience- do "nothing" for so long that one becomes completely and tragically bored).
A SAHM (like me, not saying all, but probably the majority of us) CANNOT do nothing but childcare and housework without going clinically insane.
I flat out couldn't afford to work (daycare cost more than I could make). Now, myself, I have an education I need to get, so a LOT of those years were / are filled with school. But I've had to take a couples years off -money issues-, and that time still needs to be filled.
Pursuing. Your. Own. Interests.
What do YOU like to do? What have you always wanted to do, but haven't had time or money for?
WRITE THAT LIST
Some things you'll only be able to work for in the future... OTHER??? You can do them right now! It just takes a little bit of creativity and the sleep dep wearing off (which, with your youngest at 1yo, should be happening this year, most likely. Um. Hate to say this: 2 years. When your youngest is 2years old is when most mom's suddenly wake up and "feel like themselves again". It takes about that long to recover from sleep dep and being needed around the clock.
So what's on that list? Languages? Sports? Travel? Wine? Coffee? Reading? Writing? Photography? Spreadsheets? Astrophysics? Caligraphy? Underwater basket weaving? What do YOU like to do?
Now... what is financially possible? Find at least 1 thing you can do at least 1x per week, and 1 thing that you can work towards over the next year or three.
Then you take your kids with you, or you carve out some parenting time from dad or money for babysitting... and DO them.
Work towards something to look forward to EVERY DAY.
Something that is not childcare.
Something that is not housework.
THINK: What do I want my kids to describe me as? (Aside from best mom ever).
"My mom's a/an ____________."
As your kids get older, you can start adding more things. BUT FOR THE LOVE OF PETE! Start those things now :) :) :)