It's your toy, you're welcome to license it however you wish. You are not welcome to call a source-available license as Open Source, because it is not open, it

It's your toy, you're welcome to license it however you wish. You are not welcome to call a source-available license as Open Source, because it is not open, it is just available for reading Citing Sentry as inspiration is almost as bad as citing Hashicorp, since they both decided they were open until it inconvenienced them