It's different when working remotely during a pandemic or not. Yours (and mine too) lack of motivation are likely due less to remote nature of work than to our isolated limited lives in general.
I'd say try to enjoy this, focus on things other than work for now.
Definitely this. You might even find that stopping trying to be more productive actually makes you more productive in the long run. Give yourself permission to do the bare minimum for a few days, and sometimes do nothing but relax. Loosening the bow for a while could let your mind reset and rediscover its sources of motivation.
I'd say try to enjoy this, focus on things other than work for now.