Timing can help sometimes, but there isn’t one perfect posting time for Shorts.
As a starting point, try:
Weekdays: 6 - 9 PM
Weekends: 10 AM - 12 PM or 6 - 9 PM
But honestly, your Audience data is more useful. Post when your viewers are most active, then test different times for 2-3 weeks. Also, retention matters way more than timing. If people swipe away in the first second or two, changing upload time probably won’t fix the reach.