Marketing a domain

Hi , I have a domain which I'm looking forward to sell.The listing got many views about a month ago and received many bids upto 2.5K $ on GoDaddy but I didn't sell it as I wanted to check it's value.

But now I'm interested in selling the domain.What do you think is the best way to promote the domain to get more bids?

I don't want to market to endusers but investors.So far I have decided to market on DomainShane , buy GoDaddy auction upgrade and ZandiBot I think.