I had two different part-time jobs before first baby, one in a nursery and one as a sales assistant in a high street shop.
I gave up both and although I wanted to return to some kind of part-time work I didn't fancy either of these jobs.
The nursery boss was very unflexable and it would have felt strange to pay for my baby to be looked after and then go and look after someone elses. I never felt like I fitted in in the shop, I was never trendy enough .
When baby was about 5mths I was encouraged to work p/t with a big company that works with the public in customer care, I loved it and I am so glad I got "out there". It was only then that I realised how bad the PN depression had got. I had to act confident and cheery.
Even now I am very shy as a Mum but quite outgoing at work and think nothing of standing up in front of 50 staff to brief them. At work I am not a "Mum" I am me!!!
I am lucky that my MIL could look after Ds at first and it was only a few shifts a week. Wouldn't have fancied a nursery when they were babies.
Take the chance to change your career if you want or do some study to keep you up to date (or advance you) in your present field. If you fancy a change think sideways and think about what you enjoy or a hobby you are good at. There are some genuine work from home options (but lots of scams).
If moneys not to much of a worry consider voluntary work of some kind, often they are very flexable about how many hours you can contribute.
I now have 3 p/t jobs and my own p/t business . I only have the third job because I didn't have the b*lls to phone and un-accept it.
Good luck and have fun .