here are some games that you could play that can get a lot of np from playing all of them, sometimes more than 12k each day, so that would be about 79k each week!(but if you are good at other games then play them cos you could get a better score than on these games and get more np)
Extreme Herder
Petpetsitter
200m Peanut Dash
Rink Runner
Neverending Boss Battle
Toybox Escape
Meepit Juice Break
Whack-A-Staff-Member
Warf Rescue Team
Meepit vs Feepit
usually I don't play all of these each day as it can take up a lot of time, but just from playing the first 4 games on that list I get about 6k
also you should go to the money tree sometimes, usually there isn't good items there but one time I got an item that I could sell for about 17k! I have also seen a codestone there once, and there was also 2k donated by the wishing well. Usually you won't find anything good there and you shouldn't go there every day but it is worth a try!
You should also do the daily things like Coltzans Shrine, Fruit Machine, Tombola, Deserted Tomb, Underwater Fishing, and the Advent calender(only in december.)
If you have any spare items that you don't need, put them in your shop or trading post, and some items you can buy them from the normal shops and sell them for a lot more (this works best for chocolates, books, and petpets)