As long as its an active real estate market, and its not overrun by other wholesalers, it's likely fine to operate in.As far as finding sellers, you have a few options.

I would like to keep the momentum going and get more active.

If you engage in an active business such as flipping - UBIT may apply, be sure to speak with knowledgeable CPA to understand the tax liability. 

Currently seeking out contacts in southern Maine to find deals.

I’d narrow your search to one maybe two max and seek to build relationships with the tips @Theo Hicks provided.It pays to be a player in the market so breaking in will cost you more at first than those who have been there before you.

You don't need a long buyers list, just a few connections with active investors who are looking for what you are finding. 

I have been an active user ever since! 

Hot- a few months ago here meant super active.

I'm mostly involved with buying distressed/value add properties.Be happy to jump on a call or have coffee with any wholesalers who are looking for an active buyer to put on their buyers list.

Keep an active papertrail.