Sorry @PopiLongJon it's a difficult time at the moment, do you have any help for your depression and any time to yourself just to breathe away from kids and have some peace and quiet? I find that helps me a lot, DH will take them on a walk and leave me at home for an hour. I need that time just to be alone and muster some enthusiasm.
Similar aged kids here. I think by this point everyone has done the 'build an obstacle course inside' type of thing about a million times so we're all running on empty a bit. We've gone for some slightly odd options to entertain them and bring a bit of fun / break up the monotony.
We have invented visiting fairies who occasionally bring the kids little things like a new colouring book. It gives them something to get very excited about. I have managed to find some free groups on Facebook where you can pay postage for things, so have managed to swap out some toys to give some novelty without spending a fortune. Plus the make believe element helps kill time. We spent a day making a fairy post box for the fairies to put their letters and parcels in. We bake the fairies cakes (for me to eat in the evening
) etc. Helps on walks too (we collect things for the fairies as we go as otherwise it's just bloody cold and boring).
We occasionally have a party for no reason (party food, party games etc), which the kids love. Makes the weekend vaguely more weekend like and adds some fun.
We also do a 'cafe' where we pretend we've gone out to a cafe and I am the waitress and they're the customers and we make it look vaguely like a cafe and put music on and have some cake and things just like we would if we went out (that sounds so sad reading that back), but it makes it a bit more fun than just a snack.
Our local library is doing book parcels to collect which is very helpful.
Whilst it's cold we're playing with ice a lot in the garden which they seem to really enjoy (me less so...!).
They spend way more time in their pyjamas than I thought was physically possible, and the bath is stretched to about an hour. Think everyone is just trying to do their best, mine are definitely having more screen time and snacks than they used to.