Can you imagine giving up now after 3 years of playing and your high C was available from next week.
I would never forgive myself.
Those few notes above the staff open up a whole new world so keep going.
Had a go at Clifford Browns " Once in a While" last night.
In the entire piece he goes to A above the staff maybe twice with vast majority below F.
You don't even have to play the higher notes to start with.
Download off internet for some inspiration.