Ugghh hair struggles 😩💇‍♀️

I have no idea what to do with my hair. It’s the worst. It’s kinda thin and either wavy or curly. Either I’ll use a product for curly hair and get super curly but greasy af hair or use anything else and have flat, dull, frizzy hair. There’s no in between. I’ve tried Devacurl, keratin products, tea tree oil products, coconut, stuff for thickening, stuff for shine, I’ve tried cool water rinses, masks, different combinations of conditioner and no conditioner, wearing it certain ways to bed, and never use heat or sprays. I’M SO FRUSTRATED!!!! Please help a girl out 😭