Advice
 

I am a fairly amateur musician, barely a year old working and improving everyday. I was never one for sheet music and play mainly off ear and hand and plenty of practice. I am specifically working with Keyboard at the moment and notice that when I am composing a piece on the fly I often go quickly, but have trouble remembering how exactly to play it over and therefore spend alot of time teaching myself my own music because of it. (Roughly a few days up to a few weeks depending on how complex the composition that came to mind was) any advice on how to absorb this quicker, preferably without perfecting a mastery of sheet music. (Though, if that is the case of this error, I will bite the bullet.)

Write the chords, that should be enough to remember the meat of it.

Record what you are composing. You can always reference the recording later on and re-learn what you did.

Yes, right when you get an idea record it on your phone. I literally have hundreds of recording entries for song ideas.

Third confirmation for "record it". And if it's a bit fast for that, or you can't remember a chord, just record yourself breaking down chords and playing it fast and then slow, like this guy