Losing motivation to create gameplay

Hello,

I have a problem that you probably have too. I don’t have a problem with coding, but my problem is that as the game progresses, I lose motivation to create gameplay and no matter how much I think, I can’t come up with any ideas. I’ve searched the internet a lot, maybe I’ll find an AI chatbot, but I haven’t found anything.
How do you solve this problem?

regards,
Saeed