Convert Merrick Bank secured to unsecured card?

[Mayo]

I got a Merrick Bank secured card a couple of years ago as my first card post 13. It has a $3 a month fee. Has anyone on here had one converted to an unsecured card. I have a capital one and barclays card now. I would like to convert this to an unsecured card. I may close it eventually if it won't convert.