I think the secret is to go easy on yourself and not worry if every day is very low key! Also don't kid yourself that other parents are doing a perfect job.
As a caveat to my response, I have to say that me working 3 days a week and DD being at nursery those days must make a significant difference to how Covid restrictions feel to us as we still have 3 days of almost normality.
2019 was a very busy year for us and we were constantly bombing around trying to see people and do lots of trips etc. Nice but exhausting! From January 2020 I had to budget severely so we also had a very local January/February even before Covid came along to make everything difficult!
Over time I've let go of the ideals of wonderful planned activities and needing to do 'exciting' things. We have learned to potter about like absolute experts and can while away the hours/days just with a good walk out for 1–2 hours, time for playing with toys, sitting drawing together, baking etc. Children don't actually need the whizzy stuff.
I'd say a real turning point for us was me realising that DD behaves better the more I involve her in my mundane household tasks. She likes dusting, washing the car, doing bits to help with cooking, putting her own plate in the dishwasher etc. She wants to do this stuff and helps to turn chores into activities that keep her entertained.
We've also in the last couple of weeks designated Saturday evenings as pizza and a film as DD can now enjoy watching some carefully-chosen films and she loves the novelty of a TV tea. It gives some structure to our week!
In terms of my own sanity I enjoy planning and cooking meals which I've found therapeutic this year.