I wont discourage you from doing something else. But I will advice you to look before you leap.

Business one does not have deep knowledge about, especially in Nigeria is not encourageable. Not even without strong perception of the Nigerian market.

Investment is also very risky without the knowledge of the form of investment. And that leaves us with the last option. A form of investment as well but demands little on your part, even without knowledge. And that is REAL ESTATE.

No economy, good or bad can do without it. You dont need rocket science.
You dont depend on market trend or bull run.
You are sure of substantial return every year. You can use it to generate income for yourself.
You can use it to raise capital to launch or run your business.
It is a source of passive income.
You can buy it instalmentally(especially with a registered, licensed company with good reputation)
You can be permanently free from office bossiness.
Your money is SAFE(provided you bought from a registered,licensed company, with integrity and good reputation)

You have two options with this form of investment, I will recommend:

1.Buy a property, 1 or 2 acres( from a company/owner with good reputation and integrity). And let it appreciate in value over time while you work. You get at least 30% per anum. Meanwhile, only four months can give you 30%. From what I have experienced as a realtor. Especially in good locations with lucrative potentials for your assets.

2. Let me use it to get(market for) more clients(buyers). On each sale, you get 8% for complete 10years.

3. You can sponsor my real estate business and secure a 50% life time share.

Note: You may reserve 20% as living expenses. But still Nigerian banks dont help to enhance your liquidity. So, to avoid amputating your 20%, you may extend it to another trusted, registered real estated owner/company with years of armorous reputation. And contact them ANYTIME you need liquidity(your money).

For a better discussion my Whatsap contact is in my signature.

Good luck!