I think I agree with you, although I have gotten reasonable jobs here. But with the number of proposals I have sent, if I was probably from the U.K, i'll have more opportunities. I have noticed few things, but I'll rather not say...I could be wrong. Just take a look at the screenshot, it says it all... things like this could be really discouraging.
In my opinion, you have to work hard on your profile. People may or may not be skeptical to hire Nigerians, but, if you have skills and certification no one can deny your ability.
First of all, congratulations on your profile approval and welcome to Upwork. There are various ways you can get paid here on Upwork. However, the fastest and most convenient way is the Local Bank transfer. It's the fastest because it takes less than 3 hours(for me, I use GTB) to get credited, most convenient because you get the naira equivalent, no hassle of trying to sell your dollars. Finally, it's quite cheap, the transaction fee is less than $1.00.
Just add your bank details and your bank swift code(search the internet, its there) and within a few business days, your account will be confirmed. Note: Your account name and Upwork account name should be the same.
However, if you need your earnings in dollars, probably you want to make some transactions in dollars directly or you have an easy way of reselling the dollars, you can go Payoneer.
For now, your key focus is to land those jobs and build your job success, getting paid is one of the easiest processes on Upwork. Once again, you are welcome and good luck.
"A dream doesn't become reality through magic; it takes sweat, determination, and hard work."
Firstly, I do not think profile approval on Upwork is controlled by humans but by alogrithms for the first stage before the humans do the once that came through the first stage.
However, checking your profile, it is too weak if I may say. You still need to go back and tweak it. You should not just resubmit after being rejected. I will list some things I feel you should brace up on your profile.
These are just tips and doesn't gurantee the approval, but I wish you success.
"There are no secrets to success. It is the result of preparation, hard work, and learning from failure."
Keep trying, no one trusts Nigerians but we still push. All I can say is keep pushing bro... You'll land something soon. That was how I started and I'm still struggling...