If anyone hasn't found any suggestions among the many on this thread, have a search on the internet and see if you can find anything there. If you STILL can't see anything that you want to do, why not consider doing something that you don't want to do, but which would help some of the many people who would just love to have the luxury of choosing an activity.
If yo like cooking, is there any way you can provide meals for an NHS employee who is ready to drop by the time they finish their shift, but still has to cook? you'd have to organise getting ingredients and handing over dishes without contact, but that is not insuperable.
If you like interacting with people, could you volunteer to phone half-a-dozen vulnerable or older people who can't go out and never see a human face or hear a human voice? There are lots of schemes to check regularly that they are Ok, and give them something to think about other than their loneliness, but not enough volunteers to contact all those who need it. Ten minutes of conversation with each of them would set them up for a few days, and fill an hour of you dragging time.
If you think hard about what someone might need and what you can do, there will be other ideas out there. You could help others to bear the lockdown, as well as relieve your own "boredom".