Lack of motivation - give in or fight it?

Read a book definitely. But planning a time to get down to some of these things is probably a good idea, if you can stick to it (I'd have difficulty!).

I would say take things as they come, we get to a certain age and for the past goodness knows how many years we have lived to a timetable but now it is time to stop and smell the roses.

Do nothing. Is underestimated as ‘a thing’ but is definitely a thing with us. Whenever babysitting duties, house moving traumas, and having relatives stay eases off we just lounge around and do nothing. Never lasts long so we make the most of it.

Read a book.

Give yourself a holiday till 1st September then roll up the sleeves.
I have started now to give myself a proper lunch break. And a proper coffee and tea break and will stop trying to do several things at once.

It's good for you to occasionally give up and do very little. We need to recharge out batteries sometimes. That's my excuse for not doing much.

Probably give in and do something I want to do, like read a book. I only fight the inertia if it's ongoing for days and I'm getting nothing done. That's when it becomes pure laziness

I am in the same sort of position. Just finished with the 5th lot of visitors this summer.

I would chill. But going somewhere at some point, so decided before I flop, to do some packing, while I am still standing.

Definitely give in for now, at this point.