I normally don't critique posts on this forum, since I don't want to be seen as snobby... but since you're offering to edit and proofread for people I figured I'd point it out.
Your prior post was riddled with errors, mostly basic and simple ones, too.
Are you In need of an editor?If you are,then I'm quite interested in it.I'm very good with English and I bet you will like my skills if you give me the chance.We can negotiate the pay after you have seen my skills and I'm certain you won't regret working with me.Give me the chance to showcase my skills to you.This is my gmail..."
Starters... where are your spaces? You do realize you need to have a space after the end of a sentence, right? I would trust my editor to know this. If you admitted to being new and still learning I'd excuse it, but you clearly state that you're "very good with English".
Maybe change it or fix it up like this;
"Greetings, forgive my forwardness, but are you in need of an editor? If so, perhaps I can be of service to you. I pride myself on my top of the line grammar comprehension and can help provide you with excellent proofreading and editing for any English projects. If you're willing to give me a chance, I'm sure we can come to some form of agreement on price-per-word edits, and I'm highly willing to negotiate so we may both reach a satisfactory arrangement.
If you'd like an example of my work, please send me an email at (insert email here). I look forward to your business and in helping make your story the best it can be."
There, I threw that together in about five minutes. Not my best work, but it works as an example. Definitely super vague and shallow, though. You'd need more content in order to attract paying applicants.
Again I wouldn't critique your post like this but you are offering your services to people, so I figured you should probably be able to present your own abilities in your post. Also Grammarly scored me at 99, which is hilariously one of my highest scores thus far.
I don't mean to cause trouble, I'm just curious why the editor can't proofread their own posts... and even more so why the editor didn't see anything wrong with what you posted. Seemed a bit... I don't know... low quality. Keep working at it, though.
An editor/proofreader is supposed to notice and correct basic mistakes like missing spaces, after all. If you can't catch them in your own writing, I'd be worried for anyone you edited for professionally. These stories mean a lot to people, and they'd want top of the line editing and corrections made. They'd expect you to catch those errors.