Don't sell your essays - publish them in your name instead

If I was you, I'd set up a simple website / blog, create some categories related to the paper subjects, and post them online for free. I agree with Arakez - you are not going to make any reasonable money from selling your old essays. Even if you manage to get "some" money, you're going to wait forever for them to be released by you. The problem is that the companies that want to "buy" your essays, at least 95% of them, are illegitimate. They are foreign hacks that want to get stuff for free.

Many of them would justify NOT paying you with lousy excuses, like that your essay had already been published elsewhere or that some portions of your papers are "plagiarized" (when in fact those are direct quotes).

Try to get your name as your own person and publish them on your own. There may be some business opportunities coming from your decision; for example, someone interested in the topic may contact you and request more information or give you some business offer. You could also put a link to your website on your resume (if you happen to seek employment in the future).

I see no real value in trying to sell your old essays; whatever value would be taken away for free from the foreign fraudsters who run this business.