> it's more rewarding to double my revenue instead of halving my server cost.
How about cutting that cost to 1/10 of what you’re paying AWS, for a much better server? Since you’re running EC2, I assume you’re able to manage a server. Get a Heztner server and run your db locally:
I‘m running the system at 70% spare capacity.
I'm not worrying too much about the cost as of now because I have some free credits to spend.
Also, it's more rewarding to double my revenue instead of halving my server cost.