Truthfully all homes are sold by the owner. You are selling without professional representation in order to save a few points of commission, probably 2 - 3 %.
There are some key facts of which you should be aware. I track MLS Entry Only Brokers and Discount Broker statistics in the MLS, and compare them to Full Service Brokers. Now, this is MY MLS, not yours, however, the statistics are probably close.
1. Listings by MLS Entry Only and Discount brokers FAIL TO SELL twice as often as Full Service Realtors.
2. When the listings DO SELL, they sell on average for 2 - 2.7% LESS list price versus sale price.
3. When they do sell they take longer to sell.
So, you need to sell, need to save money, what do you do?
The costs you are saving go to pay someone for their expertise. We see postings like yours a lot, with the same theme, "why is home not selling?".
Selling a home is not just putting it in the MLS, craigslist, etc., as you are finding out. Selling a home is more like playing chess. You need to know who your competition is and what they are doing.
Surveys show that the average buyer looks at 20-30 homes before they buy. So when a buyer is ready to buy, they contact a REaltor, they select properties to see. The information that you lack is what homes, that are your direct competition, are doing in your area. As the summer buying seasons draws to a close, you find yourself still waiting for a buyer, yet chances are a number of homes, like yours , have sold already while yours was on the market. The problem you have is that you don't know their selling price and which ones sold.
The truth is that if your home were priced correctly, it would have sold. The Realtors are not on vacation. They are showing buyers homes, and then writing offers. So the market it talking to you. It is saying you are not priced right.
To put things in perspective, in any given market, 20-25% of homes sell in the first 30 days, closest to asking price. In my MLS that means 99.7% of asking price. At 120 days they average 92.3% of asking. So that means that 75% of homes are not priced right or marketed correctly. And those are homes listed by REALTORS.
So you should not be surprised that your home is not selling, you are in the 80%. The only way you are going to get your home sold is to under price it.