I would have a look at AWS Amazon Aurora for the database as it automatically scales as needed depending on the type of data you are generating you might also look to see if mysql is the best option for all of it or if you should look at a combination of mysql and a nosql database such as DynamoDB

I recently started exploring serverless architecture with Laravel Vapour which uses the AWS Lambda to run the app which also allows automatic up and down scaling depending on traffic have a look at Taylors talk on Laravel Vapor https://www.youtube.com/watch?v=XsPeWjKAUt0

I also interested with this topic because i made 1 MLM system but i still looking for ways to improve.