Pikopuko I really enjoy your singing! I've kept listening to it! I never heard that song before so I YouTube it after listening yours and I think yours is better! I even got an TMVW account just to do this reply.
You said you had problems with the high notes, I think that's my problem too. Can you please tell me what videos from youtube you watched?
As an example, these are two of my recordings, a Sheeran song with two diferrents aproachs, what do you think guys? how's the high notes at the chorus? the rest of it? They've been recorded with my cellphone and have no effects of any kind.