Phil,
You already have a workable system, why spend yet more money on another one when your core problem is marketing and that won't change even if you changed systems and won't until you focus on it as a priority.
Think of marketing as the spokes in wheel that all feed into a hub in the centre - sales. You appear to have very few spokes in your marketing wheel and so low sales. You're not on Google maps / places, your site doesn't rank well in surrounding towns and doesn't 'speak' to your potential customers.
You don't need a new site, you need to make it work harder for you, increase keywords, remove the section knocking hwse (because it puts people off) register with as many free online directories as you can, remove your prices, (because it removes the need for them to call you) then double them and go out and do a survey for every job.
Compile email lists of potential commercial customers and email them with well written and focused material.
Go out leafleting, houses, supermarket car parks, football sports event car parks.
Each of these things and there are many more cost you nothing and just require your time and commitment. If you spend all day, every day marketing your business with your existing system you will get work.
You also need to work on the df system and try different chemicals and techniques to squeeze every ounce of performance from it so that you improve quality and thereby increase customer retention which is a vital another spoke in your marketing wheel.. Each time you go back to a customer, or they recommend you, it costs you nothing.
Do these things and with the money from the extra sales, re-invest it in better equipment.
Not 'simples' but certainly 'doable.'
Simon
