Part 1: https://grapeup.com/blog/how-to-run-selenium-bdd-tests-in-parallel-with-aws-lambda/
Part 2: https://grapeup.com/blog/how-to-run-selenium-bdd-tests-in-parallel-lambda-handlers/
If you have any issues with Lambda modules, clear selenium_layer/selenium/python/lib/python3.6/site-packages directory and install all packeges from requirements.txt in this location with command:
pip install -t selenium_layer/selenium/python/lib/python3.6/site-packages allure-behave==2.8.6
then re-deploy all modules.