“How do you get rid of anesthesia numbness fast?”

Only depends on the particular drug used. Neither You nor your doctor have any other option once a given drug is injected.

Sometimes warming up numbing place helps and so is massaging

Unfortunately, there’s no way to “get rid of numbness fast.” The local anesthetic that causes the numbness has to be metabolized by the enzymes in your body’s tissue. Different local anesthetics are metabolized at different rates and in some instances by different enzymes, depending on whether the local anesthetic is an amide or ester based chemical. Also, the rate at which a local anesthetic is metabolized is dependent on where in the body it was placed because of different blood supply. In highly vascular areas like the mouth, local anesthetics tend to be metabolized faster. In poorly vascular areas like fat tissue, Local anesthetics take much longer to be metabolized. Finally, sometimes other medications are mixed with local anesthetics to make them last longer.

There is really nothing you can normally do as a patient to "speed up" the return of sensation following a regional anesthesia block. However, a block may last a shorter or longer time based on many factors, most of which are exactly which medications were used in the anesthetic, and exactly where and how they were deposited into the body tissue.

Numbness will take its time. You just follow instructions and rest.