can’t find my workouts

If you really mean Workouts as the pre-planned instructions for a specific activity session, then you can find the instructions in the manual here:

• Venu 3 series Owner's Manual - Viewing Scheduled Workouts (garmin.com)
• Venu 3 series Owner's Manual - Starting Today's Workout (garmin.com)
• Venu 3 series Owner's Manual - Following a Workout From Garmin Connect
• Venu 3 series Owner's Manual - Starting a Workout (garmin.com)

And if you mean your past activities, then have a look here:

Venu 3 series Owner's Manual - History (garmin.com)

First you must send the workouts from Connect to the watch. After you've sent them and synced you find the workouts like this: Starting a Workout

Thank you!