I have been playing for since the game came out its not pinging anymore for it and if it does its rarely does anyone know a way too increase your chance?
If you've been playing since it came out, it's possible you have unlocked all your PWP's. Check with Isabelle and count how many you have and how many there are. A poster here once had that happen to him. He thought it was weird he got no more suggestions, and it turned out he had unlocked all of them.
Maybe try increasing your friendship with a certain villager. I've heard that you could get a higher chance of them suggesting PWPs if you are better friends.
Or yeah, you might've unlocked every PWP. You can double check with this website. It shows a list of every PWPs obtainable.