Does your dealership use Instagram for social media? Do they encourage the salespeople to use it as well? A lot of salespeople do not have the first clue about how to start this process. Other than just downloading the app. It's understandably frustrating when you post pictures often and your following doesn't increase.
To start, you want to make sure that you gain the following of local businesses and even other salespeople and dealerships in the area. To do this, you can search for the hashtag and name of your city and/or county (ex. #orlando), and follow users that have used this hashtag. If you are brand specific, you can also search the hashtag+your brand (ex. #mitsubishi). This may not get you all local followers but it is a good way to build them. I recommend staying away from following private profiles and profiles without pictures, as these are less likely to follow you in return. It's also good to make sure to follow users who like photos that you post.
Don't forget to invite your friends and family to follow you on Instagram, as well as your previous customers. A good way to reach your previous customers would be with an email blast or a Facebook post, on both your personal and business pages if you have them!
Instagram does put a limit on the number of other users you can follow/unfollow in a specific time period. The more established your account, the more you'll be able to follow per day. With most newer accounts, the limit is 100.
You will want to avoid looking like a spam profile. If you are following 3k users and only have 200 followers, this can look suspicious to other users. There are apps that can be downloaded to weed out the users that have not followed you in return. Some of the apps that I have used are "Unfollowers" and "Follow Cop".
This whole process can be very time consuming and seem monotomous but will get easier and easier as your following increases. Just remember to keep engaging your followers by posting pictures and stories!