Why not fulfill committed aid to Ukraine and be done?

https://www.ifw-kiel.de/topics/war-against-ukraine/ukraine-support-tracker/

My argument is not about whether we should be aiding Ukraine, more questioning why the administration is going about it the way they are.

If we don't want to help Ukraine anymore, why not just finish sending what we've committed and then let the chips fall where they may? Or, perhaps cut the aid off and be done all together? Europe has given and committed more aid, they could theoretically sort it out themselves.

It seems we get conflicting motives. How can it both be our job to facilitate peace, but also not our job to be involved? Maybe I'm conflating some things. Does anyone have better insight?