My dropshipping store came to an end?

Hi everyone, I have an Instagram dropshipping account in which I upload a photo everyday. After every 7-10 posts I post a commercial post where I call to action to purchase my stuff.

In the last few times I managed to get pretty nice amount of sales (not too much not too little), however this time I posted I got zero sales. I didn't change anything in my account, same style of photos, I'm growing by about 2-3k followers a month and even my engagement is higher than it used to be.

I want to scale from this position and I know I'm missing something in the marketing field, I believe it's not a technical issue of hashtags or following sources. Do you have any idea of what to do next to get back on the train?

Few tips:
1. Change commercial post caption, try giveaway post to gain more action
2. Buy shoutouts on similar accounts as yours to scale your business.

Are you giving something for returning customer?
Buy shout-out
Start to send email with nice discount to existing customers

it happen to me, me was related to baby shower products, at the beginning was doing good but after a year there are only a few sales once in a while, after 3 years i decide to close it, looking forward to find a way to get niche products, any suggestions?

Here's a fix : run an instagram ad for $1/day and your engagement will be back.