Your MVP worked perfectly, you put something out, gained valuable experience and now know that there is a market for hosted forums. Go talk to the people that

Your MVP worked perfectly, you put something out, gained valuable experience and now know that there is a market for hosted forums. Go talk to the people that are interested and get letters of intent. Get something salable and charge them money. Who cares if a bunch of people who could roll their own forums in a weekend are interested, what matters are the 99% of people who can't and are willing to pay you.