Rests. Survive.
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In all, I don't think the mobilization is likely to matter. The Russian problem is bad supplies, bad comms, and bad morale. When the russian front in kharkiv collapsed and everyone fled, there were many units just wandering around, and even setting up defensive lines because they didn't know the rest of the force had been routed and that the enemy was already behind them. Forcing people to the front isn't going to change this. Russian strategy has been repeating idiotic assaults on bakhmut for 2 months with no gains while just trying to hold on elsewhere. Ukraine on the other hand has been maintaining a decent momentum from their offensive, taking Lyman, and on the verge of looking to retake Lysychansk and maybe Severodonetsk again. Progress will be relatively slow, but it's not crazy to imagine another wave of collapse.
It'll take a long time to get a working army together. I'd bet on Ukraine and western support every day. The only thing that could change the calculus is nuclear weapons.
Have you seen any zombie movies?