considering you were completely wiped out on LV just a very short while ago (Exhausted for days - why?), I believe HV will break you. It seems like you’ve recovered, but take steps not jumps. HV has back to back sweet spot days, and Saturday and Sunday are long sweet spot days.
MV would be possible for you, since you’re almost there. Just try the Sunday ride at full intensity and see how you manage. The main thing to watch out for are large TSS ramps where you can’t acclimate. Keep in mind, if you’re at 400TSS and you jump to 700TSS, one week is doable, but to actually live there for a month or more, is entirely different. A smoother progression on the body is better, IMO.
If you can’t handle Saturday and Sunday of MV, then you can’t handle HV, which will have 3 consecutive days of sweet spot mid-week at 90min to 2hrs, and 2hr long weekend rides at sweet spot.
The weekend rides, if you can’t handle the intensity, there used to be (not sure if it’s still there) a recommendation for a long Z2/Z3 ride. Basically the 2hr sweet spot workout would be roughly equivalent to a 3-4hr Z2 ride, in terms of TSS. Or 3hr z2 + z3 ride.
You can opt for that in MV as well (I would).