Here are some of the ways you can develop as a professional;
a) Associate yourself with the professional teachers' associations
b) Write for publications in journals and newsletters
c) Join the e-discussion lists and subscribe the blogs such as neltachoutari
d) Browse the useful ELT resources such as journals, read them and share them with colleagues
e) Attend the conferences, present and participate in them.
Here is the link to the conferences worldwide:
http://www.conferencealerts.com/school.htm
f) Reflect on your action, assess your strengths and weaknesses.
g) Build on your strengths for further acceleration and find ways to overcome the weaknesses.
h) Prepare a professional development plan and follow it.
i) Revisit to your work every now and then and make the required changes and modifications in your strategies.