It is far easier leaving Nigeria than returning to resettle permanently, in spite of whatever anguish you endured before obtaining your visa. When you left Nigeria, some 10 to 30 years ago, you were probably by yourself. You had only one piece of luggage; no wife and no children.
You were in your mid-to late- 20s. If life was pretty bad for you, you were in your 30s. Your friends were around your age. You lived with your parents or other relatives. And if you were not that lucky, you rented your own place. Your friends also either lived with their parents, relatives, or they rented their own places.
You didn’t have a car. If you did, it was a jalopy. Now, fast forward to 30 years later; for, that’s how long it would take you to attain any semblance of meaningful living (a rewarding career, your own house, children in the university) either in the United Kingdom or the United States if you did not win the lottery and you were not a credit card fraudster or a drug dealer. Forget about the three, 10, 15, or 20 years someone told you it would take to get yourself properly situated here.