You can try replacing your modem by borrowing from a friend.
Once I had similar problem in my broadband connection where download speed was almost as promised but the UL was excessively low. For about 6 months I was unable to resolve unless I changed my modem.
Help Pls ইন্টারনেটের Upload স্পিডের ব্যাপারে সাহায্য চাই
Zahir likes this.