If you got the BTW allowance then you should apply for TAT also - it assists with things like insurance also
Also, I wouldn't base the success or failure of your business idea on one advert. I have no idea how you worded it and where you published it, but are you sure that wording and placement accurately reached your target audience? you will have to bear in mind that things will start up slow, in terms of providing a professional service a customer base is built up slowly on trust, good work and referrals and recommendations - you will need to network with local businesses and on relevant business forums and put yourself out there. Nobody gets a customer base overnight or on first attempt so I wouldn't consider this a failure, just a first step of many. Every beginning is hard, but you get there in the end.