The latest mnemonic is PRICE (Protection, rest, ice, compression, elevation) where the “protection” bit is to stop doing any activity that can make the sprain worse. This inherently includes use of crutches as @marinelife indicated.
I have had a number of sprains and if you don’t allow them to heal, you end up spraining the ankle again. If you do this enough times, other damage can occur. I have had ankle surgery and am due to have another one after a lifetime of ankle sprains—so it really pays to take this type of injury seriously!