Circular logic in that second paragraph. You base your unproven kill rate on the unproven "Russian cannon fodder" trope.

There has been no proof of "human wave" tactics by either side, despite propaganda from both sides that the other side is using that tactic.

Satellite images show individual bodies on a street. Remember the false "Bucha war crime" story? Those same satellites would show dozens or hundreds of bodies on the streets of Bakhmut if they existed. It would be incredible propaganda for the side that could show such photos.

Ukraine should withdraw. The problem is partly political. If they withdraw they will lose Western support even faster.

After about the first month, Russia has used attrition warfare: give ground instead of men. Make the enemy pay for any forward progress. They use their superior firepower.

Russia has the military equipment reserves as well as industrial capacity to replace armor and ammo faster than Ukraine + NATO. Russia has fewer troops on the ground than Ukraine up until very recently. For the last 10 months, Russia minimizes their disadvantage in men and maximizes their advantage in firepower. Now the best of Ukraine's forces are dead or wounded, and they are running out of armor and ammo. Russia has lost far fewer men due to fighting a war of attrition. So Russia's advantage grows.

This is seen on the battlefield maps, regardless of how slanted our western press is. Ukrainian victories are few and far between compared to the slow Russian advances.

Barring direct NATO entry, that trend will continue until Russia controls all of the Donbas and has decimated a large percentage of Ukraine's military.