Hopefully you would implement new, greenfield projects in Rust or perhaps Go, not C++. There's also a side-benefit in that Rust interoperates more easily with Python and similar languages, due to its features being a closer match to the C ABI.
And since we are speaking about Python integrations, Rust is still at the departure line to anything GPGPU related, even something like .NET has better tooling currently.
Go is a complete joke if it wasn't so sad. Just no.