The fact that you said "schedule a deep clean of the house" makes me think you don't have regular cleaners. If that is in the budget, get it set up.
Maintenance type dr appointments for your other kid - dentist, well check if its possible to fit in in, the same for you and for DH, and any animals for that matter!
Date nights
Fun outings with your older DC.
I personally did a ton of meal prep and ended up not eating a lot of it because it just what we wanted, but YMMV. My experience was we were not crockpot meal people so we were for sure not freezer crockpot meal people.
Get on same page as DH as far as visitors post baby. Hopefully you worked that out last time but if there were issues, prepare for them!!