What can I do or buy to promote thickness in the front?

I'm a teen with curly hair (2b I think it is?) the back of my hair is super thick but on the top or in the front is really thin, I'm not balding and I dont think I'm experiencing hair loss but it feels really thin compared to the back, I do struggle from really bad anxiety and that might be apart of it, but if there's a product that I can use to my make hair thicker (I don't care about my hair getting longer, im chopping most of it soon anyways) but if anyones knows a good cheap product that would make my hair thick quickly please let me know!! (If there's no cheap product that does it quickly it's fine,still share product suggestions please 🙏)