Don't wait. Just try some stuff out. You have no shortage of ideas, you're one of the most prolific posters I've seen. Take little tidbits from the themes you create and manipulate them. You seem to favor the classical era with your music. Fine, so what do those composers do? I would study their scores. Emulate what they do, and when you feel confident enough in your own abilities, you'll find ways to make it your own. But I think a good way to start understanding development of material is to copy what the greats have done, and when you feel like you've learned from their techniques, you can come up with your own.
I CHALLENGE you to do this. I would love to see you just take one theme, and create ideas based off of that theme into music that has been developed from a single idea. Don't worry about how long it is, or how many sections you have, or changing key, etc. Just finish an idea and give it a cadence, then create something either contrasting that or building later phrases that stem from the original idea. Think small but smart.
I'm excited to see your next posts, to see if you take my advice into consideration. If I see a simple binary or tertiary form from you in a future post, I'll be happy. If I see something called piano idea 523454235234 then I'll be sad, because it would seem like you're not growing, but rather shelling out another idea with the intent of it becoming something someday.
Keep COMPOSING my friend. Any mouth-breathing meat robot can come up with ideas, but what do YOU as a composer want to do with it? You have lots of potential, and I'm excited to see and hear you continue to grow.