Easy fix: Send more conventional munition. Don’t stand there and criticize Ukraine for turning to easily available ammunition, when at no point in the war you were able to put Ukraine in a position where it could fire as much as russia does. Artillery is what wins offensives in this war, artillery is what saves the lives of your own soldiers, especially since western artillery is generally longer range than the russian one, it allows counter-battery fire and hitting supply trucks.
And all that still ignores the fact that russia burned through their stock of cluster munitions liberally, even and specifically against civilian targets.