Is there any hope of receiving Android 13 update in m21 old edition

[khio]

No

[NOOB_1ST_ACC]

No, there is no chance of Android 13 in m21 2020 edition.

If found useful/on point then click on 3 Dot and accept as solution.

[mHappiee]

Nope.
.
But you can install some custom roms ... Google it if there are any Android 13 ROM for m21. You will have to do some work on your own.
.
Also It's risky to install other ROMs. Do it on your own.