Need funds due to knee surgery and walk again

I need money for doing knee surgery . I cant walk anymore. I have flat foot . I could walk but i had pain on my knees and backache . But after several years it got worse and worse.. All of the doctors told me that I must have surgery . But i couldnt because of the money .. and now i have pain on my knees everyday and every second . And i cant walk . Im just 31 years old and i dont know what can i do without walking till the end of my life . I really need your help for doing this surgery on my knees . And I appreciate you a lot🙏