Did you try the PWP-trick already?
I'll explain briefly.
Make sure you have no bells on you, only flowers and tools until your pockets are full. And make sure you wear a Wet Suit. Go for a swim and stay in the water for approximately 5 minutes, catch some creatures or you can do your homework while waiting. Just make sure none of your villagers spots you for at least 5 minutes.
After 5 minutes you should head back to your town and walk around until one of your villager 'pings'. It should request a PWP in like 4-5 tries.
Good luck!