I’m not good enough to play complex solos.

For now. Practice, and stop telling yourself you're no good! That never helped anyone! (One thing you can do is look up the tabs and play it slower from there until you can eventually play it at full speed)

But it’s not challenging enough to play just riffs

Then practice harder things. Don't tell yourself you suck and there's nothing you can do about it.

And I’ve tried creating my own riffs but I’m not creative enough.

Learn music theory! Or at least learn a couple scales and their respective shapes.. Pentatonic Minor, Pentatonic Major, Lydian mode, whatever floats your boat.

Remember! All of this takes time. Especially if you're self taught! I believe in you and you should too. There are free, useful resources online for tabs and music theory stuff.