Would full war and mobilising reserves really achieve anything?
to start with the quality of the average mobilised reservist is probably going to be even lower than the conscripts that they would be replacing. They would need to be armed, fed and trained.something Russia seems to be already struggling with.
They wouldn't be replacing conscripts. The current fighting force in Ukraine consists of volunteer contract soldiers. While individual instances of conscripts being there have been reported there does not appear to be any widespread or large scale deployment of conscripts. Deploying conscripts would likely be the first step, that wouldn't even require mobilizing.
They are also running out of precision weapons that they lack the ability to replace without western sourced electronics, their vaunted reserves of armour and Soviet era equipment is either obsolete or in too poor of a material condition to be used.
I'm not sure how you arrived at this conclusion. Russia hasn't even exhausted supplies of armor and artillery in line units. Remember, if a brigade or regiment send one BTG, then they have two more BTGs worth of equipment sitting at home. Russia has been routinely activating some vehicles from the reserve during large training exercises, and supplied T-62s from mobilization reserves to both Syria and Libya (Khaftar's forces) without much apparent difficulty. There is no evidence that Russia is running out of Soviet-era armored vehicles or artillery. Moreover production lines for Msta-S, T-90A/M, BTR-82A, and BMP-3 are all open. In some cases, like the BMD-4, there are limitations on production of chassis. But in many other cases (like the BTR-82 family or the T-90A) Russia can produce hundreds per year, if they want. Artillery might be a little trickier to mass produce, Russia has only put out ~2 artillery btlns of Msta-SM at the peak of GPV-2020, (and 1 Tornado-G) but Russia has piles of D-20s and D-30s in storage. There, also, are likely quite a few 2S1s and 2S3s, not to mention 2S5s (the latter were pulled from the Land Forces entirely to simplify inventory).
the Ukraine on the other hand continues to receive more and more support from the west. The support isn’t just material either. They are probably receiving high quality intel and tactical advice.
So far, aside from ATGM and MANPADS, Ukraine can't even replace their current losses from western aid. You'll note at what point Russia stepped up strikes to hit railroad infrastructure. It came after the west announced and commenced deliveries of MBTs, light armor, and artillery. The stream of those would have to be pretty constant to enable Ukraine to keep fighting. It's not impossible but fairly unlikely.
Russia did push back the Germans in WW2 but at an incredibly high cost and also with a lot of material support from its allies. Also in WW2 the population was motivated to repel the invaders. I am not sure that actually being the invaders will garner that same level of support from the Russian population.
I'm not sure what the relevance here is. This isn't WWII and wars aren't fought like WWII today. The nature of the fighting is distinctly different from WWII.