I opened my account in September 2020 and have sent over 338 buyer requests offers since then. But so far I have not received any reply to any order. Can someone please give me a little suggestion or tell me a little understanding of my mistakes?
For that you will have to give us at least one example of an offer that you sent
We can’t tell you what’s wrong without seeing what you were writing in your proposals
Check this out: Fiverr Help and Education Center (Responding to Buyer Requests).