Hi gdiocarez, I cannot speak to your abilities because I haven't seen your code, but $20 an hour is absolutely achievable. I would strongly recommend that you do also take some courses to improve on your English. Good, unambiguous communication is crucial for remote work (I am remote from the rest of my team and bad communication costs so much time and effort). Improving your English will also help the perception your potential clients will have on you and your work.

Good luck!