I feel like making the .0 version LTS is risky because judging by the past .0 versions contain more bugs than other versions. My suggestion would be having the latest version of the previous major version (1.18.2) as LTS and the latest of the current major version (1.19.3) as current and adding the previous minor version (1.19.2) as a sort of MTS that gets unsupported as soon as a new version (major or minor) drops.