Welcome to the Q&A Forum

You need to think about whether your site has been hit with a manual penalty or an algorithm penalty. If you have had no messages in WMT then it is probably an algorithm penalty. Panda is now part of all algorithm changes so you may have been hit by that. One of our testing sites got hit by Penguin in May and we decided to test out if a 301 to a new website would work...it didnt!! It took just over 5 weeks for Google to catch up and the site lost all its rankings again. I was actually surprised it took that long to be honest, Google's algorithm is too smart for that so I would advise trying to fix any problems before you give up and start a new website. Penalties will last as long as you have the problem. The issue here is, if it is an algorithm change then it is harder to figure out what is wrong. Whilst a manual penalty is worse, at least you know what to do in order to fix the problem. You need to look at any duplicate content issues you may have and if that is all ok then look deep into your backlink profile because it must be 1 or the other. If you show us your URL then maybe one of us could take a quick look and give you some more info.

Yeah i wont probably do any better or it will take a long time which i cant afford, so might as well 301 it to new domain and see what happens. Thanks

One thing I forgot to mention... Your company likely services a very local area, correct? Are you including the names of the towns you service in the keyword phrases you hope to rank for? If not, perhaps that will have a positive effect on your ranking efforts. In my experience many people think they are targeting well-searched phrases, but they have done no research to back that up. Just guesswork. Or they think they are ranking well, but don't realize its for their brand, which they should rank well for! Or, they rank well for a phrase that is not worth targeting because it has minimal searches. Again, good luck;)

is any body tell me the how we know we are improving my spam score is 5 so i created a disavow file and upload on google. but i don't know what would be the next step