Every business that uses Social Media to promote its products / services would need to work with Influencers to push the envelope. How do you find the right influencers to work with on Instagram or any other social network. There are two approaches that may work for you
Approach #1 : Search on Instagram - Use the search box on Instagram to find people, locations, tags for a particular keyword. Instagram would recommend the most active accounts / people for that topic. You could simply DM these people and reach out to them for collaboration opportunities.
Approach #2 : Find influencers offline - Go attend a local meetup of a community. For e.g. if you are finding influencers for Nikon, go attend a local meetup of photographers in your city and make friends with influencers. You could hire these friends for a project / assignment. We have seen that 1 or 2 good influencers also bring in the rest as they have already established connections in their coterie.