Hi Dharma,
I had a similar experience, but I fixed it. Let me explain that may help you!
I launched my own brand on Apr 14th, first few days, I was running a single purchase campaign & getting daily 5 sales. So I thought to bring more people & sales. Then I launched more TOF campaigns with View content conversion events.
I was getting 1000 visitors to the site, but conversion reduced from more than 5 sales to less than 3 a day.
Then I noted the huge drop in sales. So quickly understood the reasons & turned off all TOF view content objective campaigns. Only started running a few more conversion campaigns with purchase event campaigns. Now I am getting 10 orders approx daily.
So please Analyse the following things:
- what was working while you get sales
- what you did that dropped the sales.
If you want to know how I launched, you can read more about that in my LinkedIn article. Read here
I hope you got some idea to find out the reason for the sales drop.