Keep at it is all I have to say. I know it took an awful lot of perseverance for me to get Winkie to eat carrots. He likes 'em raw & shaved thin.
It took about 3 mths total for him to accept that carrots were food. *sigh* I think I tried every conceivable way to cut them & even when I found out how he liked them cut it still took time for him to start eating them.
Birds! LOL
Try serving new foods in different ways - cut it thick or thin, cook it a little, shred it, etc.
I hope this helps you.