Seller Wanting To Back Out Of Executed Contract.

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Hi Guys,

So Seller and I came to an agreement on a price on a home. We both signed it and two hours later he calls me telling me he no longer wants to sell the house for that price and he wants more. Got legal advice and RE lawyer said we have a strong case, I am trying to avoid suing process as much as possible due to it being a long process. What is an alternative to do myself to get this deal going ? 

Tried calling seller a few times after he left me the voicemail that he no longer wanted to sell but no answer. Following day I showed up in person and he didnt even open the door, he talked to me from behind the window telling me he was not selling. I was actually there to try to renegotiate the price and try to come to an agreement, but he refused to talk and said he was going back to sleep.