Ukraine had to become extremely parsimonious with their Patriot use as supplied dwindled to a fraction. In many cases Ukraine simply chose not to engage unless the Kinzal/Iskanders were optimally detected and attacking a significant target.

And the upgrades really weren't much except adding decoys that had always been an option with Iskander.

Now that worldwide inventories of PAC3-MSE are almost non-existent, Russia will push its MIRBM attacks over the next year or more. Ukraine really doesn't have many options other than to continuing their drone offensive against deep targets in Russia.

Software upgrades too - just make them fly a somewhat random path.