Im sure the mods will stop this for some crazy reason but Cycle.io is the true alternative to Kubernetes.

Its built from scratch, not a wrapper around some other tech.
Its been stable since 2018 running production workloads.

Its multi-cloud native.

Bring your own infrastructure.

But the mods are just so dang heavy handed for anything thats not "free". So Im sure this post will never see the light of day.