Hello Dac_Needs_Help,
Thank you for reaching out to Apple Support Communities.
Let's attempt to adjust the side button speed using these steps:
"Set the side button speed
- Open the Settings app
on your Apple Watch. - Go to Accessibility > Side Button Click Speed, then choose a speed.
You can also open the Apple Watch app on your iPhone, tap My Watch, then go to Accessibility > Side Button Click Speed."
More details can be found here: Adjust motor skills settings on Apple Watch
If the issue persists, can you provide a few more details? Have you been able to download apps previously? Also, what is your exact watchOS version?
Cheers!