With what? More infantry? The Russian air force has to fly low and slow to avoid Ukrainian air defense, meaning limited range, which severely limits the bases from which it can operate. Plus pilot shortages and the usual Russian "maintenance."
Meanwhile Ukraine has received longer range munitions putting all of Zaporizhia and southern Kherson within artillery range. Wagner and/or other RA units being moved to Vuhledar were wacked in Mariupol over the past couple of days as well as ammo dumps supporting Vuhledar operations.
Yes almost another 900,000 in reserves. They could also go to a full war footing and increase military production and spending. Estimate of 8000 “preserved” tanks are still in storage that could be remodeled and put back on service..mostly T-72s. Also China is indicating they may start selling munitions to Russia.
Still then there are a whole range of WMD from chemical, biological and of course nuclear.
So yea there is still room for escalation.