If it were me, I would ask myself why I am a scripter. Why did I chose to learn to code on Roblox. Because if I don’t have a reason for that then of course I won’t have any ideas of what to do.
I’m sure there is a reason you decided to learn to script. If you are doing it for fun, make something for fun. It sounds easier than it is, but find something you enjoy in your every day life and try to make something out of it in Roblox.
If for some reason, you have no reason for learning how to script (not sure how this is possible but it seems like you don’t really have a reason to script, given you don’t know what to do), find a reason. It’s going to be more productive if you have some sort of goal in mind of what you want to do. And you will know what your limits are as you try to achieve that goal - that’s how you pick up new skills along the way.
I don’t recommend just learning for learning’s sake. Whether it’s for peace of mind or for sharing with your friends or even to one day make a front-page game, find something to move towards. You will find that ideas naturally spring up this way. That’s how you test your limits.