limiting lambda to one enviroment

I ma trying to get puppeteer to run in lambda with an s3 trigger. When events are loaded one at a time it works fine. When trying to invoke 3 uploads at once, problems ensue. I am only subscribed to the free tier and my "ConcurrentExecutions" limit is set to 10, which means I cannot set ReservedConcurrency to 1 as the minimum limit for ConcurrentExecutions is 10. For a general idea i am having puppeteer fill out a page with info, i am having problems because it is entering two supposedly seperate pages onto one, and i need assistance finding a potential solution.