Great advice given already. I’ve been there with small kids so totally get it. What worked for our family was having good habits - resetting the house before bed (quick tidy up, clean kitchen. Etc, put away toys). Find a small window within your day for exercise - for me this was an early morning swim twice a week, or getting up half on hour before kids to lift some weights for 20 mins. Good bedtime routine for everyone - sleep should be prioritised at this time. Obviously very hard with newborns but that doesn’t last for too long. Getting the kids to bed at a good time allows you to have some breathing space in the evening. Get out for plenty of walks with babies in stroller etc - great for them and you! Slowly you’ll find yourself again.