In light of the new Winter '20 release and that 2GP will be Generally Available, it means we'll be able to develop and release managed packages on the AppExchange through the new 2GP processes.
In the release documentation, it mentions that First Generation packages cannot be converted to 2GP:
Use 2GP to create new managed packages. You can’t currently convert a first-generation package to a second-generation package.
How do we manually convert our 1GP managed package to a 2GP? I'm interpreting the above quote to mean that "there's not out of the box way to convert one package type to the other" but that there should be a way to do it manually.
An already AppExchange released package - is there no hope in keeping that namespace for the 2GP version that we'd like to create? Or is there no way to create a 2GP "version"?