I would say a piece of cake event is a good profit event
You only need a lvl 8 to step in the cake island and you win a cupcake that values at least 250k or if you wait a few months it can values 500k easy but that depends if the servers help or not....
Santa Claus event is profit too but its extremely rare to get a valuable stuff (most of the time you win candies and oranges) and you don’t need to be premmium to participate in the event
Lightbearer event is profit with low resources too you dont need a high level to take a torch and light at least one basin but again it depends if the server helps or not (the reward isn’t something rare but its a good profit and you also don’t need to be a prem account to do this event)
Demon baby event now is a nice profit you have to spend some time to get the reward but its a huge profit maybe you need a mid level to do this event and its not required to be premium to do this quest but its easier if you are (if you don’t care to walk alot or have enough luck to get easy tasks)