Realistically, you will be lucky to get anything. Just sell off your gear and move on.
NET profit over the past 5 years is averaged and valuation is based on this along with other factors.
Unfortunately carpet cleaning as a stand alone business is not financially viable for investor/s or someone looking to buy in. However, on a positive note, its provided you with a wage and got you by no doubt.
Sorry to be a little negative but good luck with your new venture.