So, Claire - how are you setting about doing that?
(Oh, and btw - on the postpartum depression - make sure you have had your thyroid checked, thyroid problems often appear postpartum and hypothyroidism is one cause of depression).
Take a poster board and make a collage of things that you want to attract to your life - whatever moves you. Put it up somewhere that you can see it every day. Then make a list of 100 (yes, 100!) things you would like to do in your lifetime. I know it's hard, just come up with 100 things, however wacky. (I did this many years ago after reading a book that suggested it - put it away and forgot about it. Found it about 12 years later - and much to my surprise, one of the items on it was "play in a band". I didn't even remember putting that on the list, didn't remember EVER wishing for that - but somehow, in the intervening time, I learned to play the drums at 53 and now I play in a punk rock cover band! So don't be afraid to put down outrageous things. )
As for finances - check out the Mr Money Mustache website, it'll give you great ideas for how to live better on a budget. Essential for saving yourself, I think.