what do i do with very bad quality matcha

hi my parents got me this matcha from a chinese medicinal shop and it looked alright but when i opened it the matcha smelled weird almost bitter and the matcha colour was a small yellowish hue with a dull green colour and i dont know how to use it to make good matcha

i taste tested it once but it wasnt very good and it was a bit bitter so i need help on how to finish it