If you're still running on Heroku after everything that went down last year, you really have no one to blame! We are happily on AWS now.
Did your total devops cost go up or down? I'm sure aws is less expensive than heroku but I assume now you are paying more to people to do what heroku did?
We are spending about 60% less. Workload has actually lessened since AWS is so much more stable. Getting to a similar DX as Heroku was quite the lift, but once it's done, it's done. These days we generally only have outages when we screw something up ourselves. I recommend https://github.com/aws/copilot-cli for starting out on ECS.