So, every business has the flourish and dry period but your dry period based on your story is too long.
Quickly do a business evaluation.. - What did you do in the past 6 years that you got more sales - Those who purchased or engaged you throughout the past 6 years, are they still within your customer circle? - The 4 years of low sales (What are your activities, then compare it with the 6 years you were doing perfectly well.)
I hope this helps!
Report Wisdom's answer
Aby hi. You may want to evaluate the biz performance using as a reference your business plan and personal experience as entrepreneur. Then adjust this fundamental document, apply the modifications and observe what happens. Best regards.