You should apply for a green card so that oyu no longer need work authorization when you are a permanent resident. However, you will probably get OPT before your work authorization
What changes is that you can file for a greencard.
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Nothing changes if you do nothing.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
Have an immigration attorney help you file for a green card. With the GC you no longer will need an OPT or F1.
This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.