Knowledge of colloidal silver is most important, you will not always be in the position you are now.

If things are costly then there's an opportunity. I looked and agree it is very very costly there. However I make it myself in a unit I bought for about $250.00 USD. This unit would make thousands of liters. This makes the cost per ml a few US cents.

If you had a similar machine, bottles and distilled water you could easily sell for about 800 Naira the same product that Jumia sells for 68,000. That is a huge opportunity if my quick research is correct.

Solve the problems to get the machine and materials and you could do very well.

https://www.jumia.com.ng/colloidal-silver-minerals/

https://silverlungs.com/ This is the unit I have.