Let me add a bit of context here. I have a budget. I frequently review the budget in order to "tighten things up" or "improve operational output with existing resources".
Here is a list of things I have used in the past:
"making the most with what we have"
Not a fan of that one as it sheds a negative light as if I am complaining about not having enough.
"getting as much lemonade out of these lemons as possible"
"milking every last drop out"
I've also used a few others related to wringing sponges/towels out and drinking sodas until your straw is slurping or the can is dry.
One of the main things here I want to avoid is conveying the sense that we need more budget. This is about using the existing budget to the fullest of its extent through cutting back on existing spending that is unnecessary/excessive.
Let me also add that I am looking for a colorful/creative way to say this. I understand there are lots of simple words that can describe this, I'm hoping for some jazz here.