please I want to no if mechanical engineering is lucrative in Nigeria as I'm already in my third year no insult please advise is needed from any experience mech engine

Yes it is but you must be ready to get your hands dirty while you are still in school? Go to a road side mechanic and get the practical knowledge of the theories you read in textbooks, learn how to weld,machine and learn as much practical from the so called unlearned men. This way you will be more positioned to compete in the Nigeria labour market.
Back in school,read and read to make a good grade because good grade are needed for you to apply for entry positions in big coys.
Learn basic engineering softwares and be conversant with as many as possible.
Few years after graduation leave for further studies abroad and never come back unless you have made enough money to come back to start up your own engineering practice.

thanks sir and God bless