Short of Russia's assets being confiscated to the tune of $175 Billion usd and the EU essentially taking over payment of the Ukrainian military using those funds, I have no idea where Ukraine is going to get money needed to attract quantities of additional soldiers.
That would be a possibility. Ukraine doesn’t have the money to properly pay its soldiers, but Europe has. Since Ukrainians are defending the whole continent, Europe should pay the fighters a proper wage that would encourage voluntary enrollment.
It’s pathetic that the righteous Europeans, who cry about climate change and human rights, are hiding behind slave soldiers to defend themselves, and conveniently remain quiet, because they would rather have conscripts dying for them instead of spending more money to pay volunteers.