Artillery. Artillery wins wars. The role of a soldier in the modern battlefield is a) spot for artillery and b) kill what artillery can’t.
Ukraine has been making absolutely devastating use of every piece of artillery they’ve been given, even using highly unorthodox (but effective) tactics like using Russian news broadcasts to zero their shots.
The Russians have, to be fair, also made excellent use of artillery, which has historically formed the backbone of their military. This has been largely a conflict of big guns engaged in sniper duels, when they’re not laying waste to anything that pops it’s head out in the open.