you are one who can be first and last it what you choose go ask deep seek or any AI  ask about ideas first there idea will be bad just keep making it better and then you will go to a point where you don't Much need the AI and you can just improve the story yourself i did that and i also was like that i having been making games for around 2.5 years correct thing to say  will be making environments for like the 2 years ,i started making systems  6 - 7  months ago but still was lacking idea , but then for the game jam i was just like depressed and ashamed that i was never able to come up with a solid story it was just oh open world game or oh horror game no real story i just kept telling people im making a game but inside i felt like a fraud and its ok but that's to participating in the game jam it pressured and made me do something   and you also have to pressure yourself think like a week is  nothing to lose this is my first time participating  in a game jam and i feel grateful for what i achieved in a short time so 
1. Waste Alot of time Coming up with good Idea

2. Execution And Keep of making the idea ever better

if you don't have  an idea its super hard to be motivated i know i have been that guy for 2 years anyway take care.