Self-host all the things of the kind you want to absorb. Including the builds. Use it in anger. Pull at the bugs. Look if you can add the missing features (And

Self-host all the things of the kind you want to absorb. Including the builds. Use it in anger. Pull at the bugs. Look if you can add the missing features (And later, fix the bugs that came from your patches) Pay attention to what pisses you off and what doesn't over time.