I remember when I used to often get impatient when I realized that I couldn’t grasp something specific that I really wanted to grasp right that moment. I don’t know exactly what you’re impatient about (a certain technique? Anatomy? Coming up with your own style? Conceptualizing/creating new characters?), but whatever it is—
When that happens, man, it is best to just not focus on that very thing you’re impatient on. Try to tackle something that you never tackled before, like some backgrounds or try painting a landscape, or even better: just scribble around with no intent on making a finished sketch or piece of art. You don’t even have to be making anything intelligibly fantastic; it could be the most ridiculously abnormal thing. Or, you can even play it safe and just draw things you enjoy drawing. You don’t have to show anyone everything you do. I have tons and tons of sketches and scribbles that NO ONE has seen (and for good reason too).
You’ll soon start finding yourself wanting to finally create something outta nowhere. Don’t let a lack of ideas mess you up! I hope that helps! :)