Deep-Dive of Open Bm7 Voicings - if you want some additional guidance with the Bm7 voicings I show, see this video. It walks through both of these alternatives, and for each gives you a helpful exercise (with tabs) to practice.
Ready to Practice Barre Strength? - if you want to work on your left index finger barring strength, here’s an exercise I recommend practicing. Over time, with a bit of consistent practice, your strength will indeed improve!