What can I do about my child waking up so much?

Hello I’m just seeking advice. This has been going on for about 2 months now and I’m truly at a loss and I’m exhausted. I’m a mother of 2. And my youngest is 12 months old, well. She keeps waking up between 2-3am, and it takes me an hour to even try to attempt to get her back to sleep. She just wakes up. It doesn’t happen every night but 5 times out of the week it happens. I’m exhausted. It’s ruining me. It can’t be a sleep regression with how long it’s been going on. I’m at the point of sleep training her into a crib and weaning her from breastfeeding/ co sleeping. I don’t know how much longer this is going to last and I can’t take it much longer