How you guys are doing today? Are you talking to yourself in English as a part of your practical training? If so, that'd be awesome. If not, that's still fine. You can kickstart this training from today. Please think about your pronunciation and oral fluency. Let's get into it.
When it comes to Internal Monologue, raising awareness of content that you are talking about isn't necessarily effective in developing your speaking skills. First of all, no one listens to your monologue, and the sole purpose of doing Internal Monologue is to ameliorate your speaking skill itself. Particularly, pronunciation and oral fluency are your go-to item that need to be polished. But, I know what you wanna say here, which is like how can we strike the balance between pronunciation and oral fluency. Yes, it is indeed tough to keep this balance during speaking. As I'm always saying, at least 80% accurate pronunciation and solid oral fluency are of paramount importance in speaking, especially when you are just talking to yourself. In a real conversation, yes sometimes it's hard to be aware of how accurate my pronunciation is and how fluent I'm speaking simultaneously, as opposed to what kind of things I'm talking about.
To reconcile a discrepancy between the accuracy of English prounciation and the fluency of speech, what you should do is to make every effort to master 44 sounds of English pronunciation first prior to embarking on any practical speaking training such as Internal Monologue. That is, when you are talking to yourself, the ideal situation is like where you need to be fully conscious of oral fluency only. Pronunciation-wise, by contrast, you are expected to subconsciously adjust minor mistakes whilst talking to yourself. This is definitely feasible unless you've reached at least 80% accuracy of your English pronunciation. Please try your best to achieve this level before a full-scale practical speaking training.
All in all, the thing (= content) you are going to talk is a secondary consideration, as it does not relate to speaking training per se. Don't worry about things you are going to talk. What you have to be aware of are pronunciation and oral fluency. That's all. But the better pronunciation you've already have, the faster and the more effective you'll be able to boost oral fluency. So, my ultimate advice is to get your pronunciation right first.