I don't know, I just can't feel Gobert. He should be the one stopping Jokic or at least limiting him. As the DPOY, and with this being his fourth DPOY, I expect more from him. If they can't limit Jokic next game, it's over for them. Also, Gordon stepping up is another problem for them. They need to play defense if they want to extend this series, but their confidence seems to be fading.
Nuggets manage to ready them after that 2 straight losses, now, they just made a good adjustments allowing everyone to spread and take good look shots, while if Jokic can force himself inside they are allowing him to create his own space and play his usual game, that core players are all contributing either with good defense and a support offense when Jokic needs them.
Right, 3 straight wins now, it feels like they are going to make a sweep (technically though it is not considered, but winning 4 straight games after a losing the first 2 in your homecourt, tells something about the character of the Nuggets).
And same with your observation, Gobert needs to adjust and try harder stopping Jokic, if they don't find that right adjustments, it's over for them Nuggets will do everything to finished the series to have that rest advantage advancing to the conference finals.
I don't think there's anything that Gobert can adjust, he might be DPOY, but it's different when you are going against the MVP 1:1. Maybe they will go back to the old Naz Reid or Karl Anthony Towns in guarding Jokic. They might slow him down and force some bad games.