Ways to get in touch with Instagram Marketing Agencies?

Hey everyone! I recently got into Instagram Influencer Marketing (mainly providing growth through giveaways), averaging around 20-30k growth to each client, per giveaway. It costs me around $20 per 1k growth to break even, and everything above that is profit, hence why spots are sold for $600 on average.

The issue is that I don’t know how to brand/market my product, and the people around me that resell (just like me) make a lot of sales.

So I thought of getting in touch with SMM Agencies that are good with finding clients, in hopes of them selling growth at a higher price, them making good money and me keeping minimun profit.

Are there any ways of reaching out to such agencies? I don’t even know where to begin