Great things to do while in quarantine:
declutter your room/apartment/house
re-arrange a room to give it a new nice feel
renovate/paint
declutter your attic/basement
do some sport (most apps are free)
learn to cook/improve your cooking
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Let's not focus on what we CAN'T do, but on what we CAN do. ♥
Also, when you find things you don't need anymore, put them on ebay (maybe even ebay classified ads,idk if other countries have that but germany does
)