The next step is usually finding critique partners. This is a free way to get edits done. You can try posting on the Critique board or look for someone in Critique Groups or through your local SCBWI chapter. Critique partners can show you flaws in your work that you may be blind to. We all have blind spots. Only pay someone once you can go no further for free. (If you've already worked with partners, ignore this paragraph.)
We have a few members, including myself, who critique for a price. Also The Book has a listing. Many authors do this work as do former editors and agents. I haven't worked with anyone, so I won't make a rec.