Even if I force myself, it might be tough

The tutorial is designed to be easy for beginners, but there are too many things to do, and I think you won't be able to enjoy it if you don't understand them. At some point, leveling up becomes tough, and I believe you'd enjoy it more if you spent money. However, I can only see a future where I'm trampled by those who are ahead, and since my point-earning activities are over, I've uninstalled.