Have you tried the aircraft mechanic (engineer) route as an entry point?
I have no idea about Nigerian aircraft engineering requirements, but in the States an Airframe & Powerplant License can open doors to prospective aviators.
Granted it was ages ago, but at my first helicopter mechanic job my employer (a small ag operator) was willing to trade flight hours for work time. Probably violated every labor law in the books but that was then. Might be possible in Nigeria these days, might not, but worth a look.
By the way, many believe that mechanics make the best pilots (at least we buy the beer more often).
Good luck, don't let up!