We need more facts to give you a clear answer. But technically, if you overstayed, for more than 365 days, you will be barred for 10 years unless you get a waiver of admissibility. Also you need to have a reason to be able to get the greencard such as a marriage petition, employment based petition, etc. The next step, if you are eligible to apply for a greencard, is to know if you can qualify for a waiver. Talk to a good immigration lawyer who can assist you.
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