Grammatical error is changed to:

I am good at drawing, and many of my paintings have won prizes.

I hope you like me.

I can be your friend soon.

Can be removed, like replaced by other words, such as:

I hope you will be happy to meet me, and we will become friends soon.

My favorite color is sapphire blue. Before I like singing and painting.

I hope you have a good time in your new school! Come on!