I have the M1 MBA 8GB 512GB after upgrading from the same machine as you - which I agree has been the best computer I've ever owned. I started to get regular crashes on the 2013 machine with Catalina, then more so with Big Sur so decided it was time. Love the MBA, screen is bright and clear (my MBP 2013 was badly delaminated), still getting used to the keyboard which IMO is not quite as good, battery life is incredible (I would get about 2 hours out of my MBP on a good day), everything so responsive.I'll be getting an M1 MBA or MBP (probably the latter) to replace my late 2013 MBP - the best computer I've ever owned, but starting to show it's age when presented with any kind of heavy workload.
Only slight hiccup was yesterday when it ground to a halt (fixed with a reboot) running Adobe Acrobat in edit mode with a big doc. I'm putting that down to the Adobe software.
I'll rebuild the MBP - my son is waiting to ditch his HP Windows laptop!