I think that coming up with a good project idea is a hard task. Don't listen to people that claim they have so many ideas. Most of that ideas are probably bullshit, that's why they have so many of them.

In my opinion, it can take even a few weeks to come up with something that's even worthy of doing. You should be asking yourself what are the reasons not to do it first. Try to observe your life every day and see if there is something that drives you nuts or maybe something that makes you procrastinate. After that figure out the solution and go for it.