[Codo]

In fact it isn't hard, it only takes that long because I hardly get focus and easily lose it. That's more tiring than actual composing, sometimes I'm exhausted before I even write a thing, so I take a break, then another, and so on... constant mess either

Same here. I have a short attention span, and it's really messing with my productivity. I tried different strategies, but it's no use: I can work/focus on one thing just 15-30 minutes maximum.
I constantly have to shift my focus to keep up my productivity. But this also means that it takes a long time for me to finish one thing.

for instance the piano is quite distant what I liked but I already don't

I especially ike the piano arrangement.
Did you use a step sequencer or played it by hand? It sounds like the latter.
It's much more simple the way that I play it. I'm not that good at improvising and generally just use broken chords for accompaniment.
Booooooooring.
Well, I should not complain about not having the skills I want, if I keep wasting my time.