Well, it doesn't sound like you had an emergency reason for leaving the U.S. or for staying out so long. Anyone that is a Lawful Permanent Resident (LPR) and is outside of the U.S. for 180 days or more within any 12 month period (not necessarily calendar year) creates a rebuttable presumption of abandonment of residency. That presumption can be rebutted by evidence to the contrary such as filing U.S. taxes, maintaining a home in the U.S. and paying that mortgage or rent, maintaining a U.S. drivers license, U.S. bank accounts with significant movement, etc.
Someone that has been outside of the U.S. for more than 1 year without first having an approved re-entry permit has abandoned their residency and only in very few exceptions (such as serious illness) can they get it back.
Here is an official link:
You could try for an SB-1 Returning Resident visa, but I am not sure that you would be able to get an approval because of the reasons that you left the U.S. and stayed out. Here is a link if you still want to try:
If you fail with the SB-1, then it may be better to officially file an I-407 to abandon the current green card and wait for the process through your brother. I am truly sorry.
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