Have your sales pitch ready with all the stats about why someone should pay the maximum amount for the domain. It's not enough to just want a good price, you have to prove that the domain is worth it.
Flippa is not a good place to sell domains. Will suggest sedo auction for a domain. $2300? Seems you have a premium one.
In Flippa less potential buyers. I recommend platforms such as Sedo, GoDaddy Auctions where there are more buyers. However selling fast depends on the domain name you are selling.
Better than what? What people are willing to give you? The best thing to do is offer a better domain for sale I suppose.
You need to promote your auction. There are tons of different methods out there you can use to increase traffic into your auction. Don't just start it and forget about it. Tweet it on Twitter using domain hashtags, buy advertising on places like NameBio.com, put it in your forum signature link..etc.