I wonder what the aversion is to using a plain old server / vps. It's really not that difficult to deploy nowadays [0][1][2][3] and I'd rather get an $8 bill every month as insurance than ever worry about shit like OP just went through. It'll probably be more performant anyway due to cold starts and "edge" still having to hit us-east-1 for data.. cache your static files with Cloud Flare/Front. People are always surprised by how much traffic a single VPS can take[4] and believe it all has to be serverless to be web scale. I believe HN still runs on a single core or something.
There's a ton of places to get cloud credits as well, too many to link, so just Bing™ it
[0] https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_...
[1] https://aws.amazon.com/apprunner/