Why has my reach on my photos gone down?

my instagram growth has come to a halt. I was getting a reach of at least 2000 and now its down to 100-200? any tips for getting it back up. are there any services these days I havent been able to get over 1650 followers in sometime.

Did you change anything on your account before this happened? There has to be something that IG didn’t like when it comes to your activity or posts.

Do you post your own content? Do you use hashtags on your photos?