They do seem to have been progressively degraded throughout the war. Formerly "elite" battalions seem now to be bulked out by inexperienced conscripts, the more experienced personnel often having been squandered in futile and pointless assaults, and the losses in materiel, overall, are significant - otherwise, Russia wouldn't be trying to field ancient vehicles and weaponry, as they clearly are.
Added to which, it's the Russian presidential elections in March 2024, and it is likely that Putin is not going to want to fan the flames of dissent with further rounds of overt mobilisation, which will exacerbate the manpower shortage.
We don't know just how costly to Ukraine these tremendous, though unsuccessful, assaults are becoming, but the picture - often supposedly powerful units retreating in disarray following their assault, only to attempt a further counterattack - would suggest that Russia is probably taking disproportionate levels of casualties in comparison to the Ukrainians.
While there is evidently quite a lot of learning and adaptation going on at the lower levels, it seems as if Russian military doctrine remains unchanged at the top, and completely fails to take into account the limitations they are increasingly operating under.
Add to that the attrition of Russian air defence kit (S400 batteries being attacked, and losses of rare and hard-to-replace electronic warfare equipment), and I'd say the picture is looking increasingly unpromising for them. Which is not to say that Ukraine has got it in the bag, but I imagine that, if Putin still had hair, he'd be pulling it out in handfuls...unless he's ignorant of the picture on the ground, which is also possible.