The way you end your emails is quite personal. You probably have your favourite sign-off. However, you might like to try something different now and again.
Personally, I hate seeing Thx or Rgrds. It really doesn’t take much longer to write out ‘Thanks’ or ‘Regards’, now does it?
My short list
All the best
Sincerely (rather formal)
I appreciate your (help, feedback, input …)
Have a lovely/splendid day
Enjoy the day/the holidays
Sending you lots of positive energy (and good vibes)
Do you have sign-offs you’d like to add to my list?