Put that block of suet into a cast iron skillet (or regular skillet) and render it down on low heat. After a while, the fat turns liquid and you are left with crispy pieces swimming around that are delicious to eat as a snack.
Pour the liquid into a glass container and let it sit on the counter. It will harden and look like the photo below. No need to refrigerate. It will last you months at room temperature with an airtight lid. I keep mine by the stovetop so I can easily use it for cooking.
That’s what I’m doing. We butcher a cow almost every year. Used to throw out the suet fat. No more! Wife takes a purified version to make balm for skin treatment/moisturizer... When purified, it no longer smells like beef.
https://www.youtube.com/watch?v=M4UiZe4mjmg