Running a Fly app backed by DynamoDB Global Tables is an option. DDB keeps a copy of your data in all the regions you specify, each Fly instance can connect to the nearest region, and writes are propagated with eventual consistency & last write wins.
And most Redis commands can be mapped to DDB, I worked on a lib to do that.
And most Redis commands can be mapped to DDB, I worked on a lib to do that.
https://github.com/dbProjectRED/redimo.go
https://github.com/sudhirj/aws-regions.go
https://aws.amazon.com/dynamodb/global-tables/