**Did you implement Steam DRM on the release? **
That is not a silver bullet but can help protect you a little bit.
**Did you release a Demo first or do a pre-release? **
This would have given you some insight in to the problems that users encountered and may have helped sort these issues before release.
**How did you test your game? **
This is extremely important as you are too close to the game to be able to effectively test it and give it a critical eye … this ties in to doing a demo release or pre-release.
What was your Steam Greenlight process like?
How long did it take … Was it well received … What promises did you make.
I think if you are really passionate about your game and want to see it succeed, you should get someone to help you fix the problems or try to fix the problems yourself. Maybe move the game back in to Pre-Release and reduce the price … you will probably have to chat to Steam about this. Good luck.