Public Transportation, cheapest route from Newburgh, to Potsdam, NY?

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I lack the ability to drive and need to leave Newburgh, New York and travel to Potsdam, New York on a personal trip. How can I do this more effectively than traveling to New York city port authority( ~20$) and then taking a 10 hour bus to Potsdam, New York(84$)?
By effective, I guess I mean a good combination of price and time.
Please be as detailed as possible, I am a shut in and traveling often confuses me.
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