Was you doing things differently before, ie different stock profile, cheaper prices, different advertising platforms ?
Do you have a contingency fund for the bad times? this often gets overlooked but if you are 100% relying on the retail motor trade as an income then i think everyone should have one. Each person would probably come up with a different figure but personally i would want minimum 3 months living costs tucked away that only gets touched if i cannot draw a wage from the business on a downswing. When things pick up you can top up the contingency account and should do so regularly when you can to build it.
This helps to take the weight off so you can concentrate on the day job and still pay the bills ( in the short term )
Another option as a home trader is you have the luxury of being able to take on a job as well when things turn bad, still doing 2 or 3 on the side and building up a cash pile in the process.