Well done.  Here is a possible rewordings of your notebook entry.

Help me, please

I have joined this site not to learn a language but rather to teach one.  I am an English teacher from Guayaquil, Ecuador, and I have been teaching English for about ten years.  I work in a high school in my city, but I have got a couple of hours a day availabe to teach online.  Please let me know if you are interested. Thank you.

Best regards,

[Better not to say 'if I stand any chance' because it makes you sound desperate and lacking in confidence.  Instead, you should present yourself as a competent teacher who is available to teach students if they are interested in learning English.

I think it sounds better to say "I have" (tengo) rather than "I have got" which is more informal or colloquial.]