To get interest up you need to attract miners. To attract miners, you need to make the coin profitability above average by either you or your investor investing in the exchanges & push the market price up. Any coin without miners are a dead coin, if this coin continues to have low diff and coins are easy to mine, it will become harder to rise in price and stuck at this price indefinitely due to large sell orders. It's all about the first 2 weeks to get the diff up.