Unable to connect iwatch - no options besides let’s start pairing- and it won’t pair

Re: no options besides let’s start pairing- and it won’t pair

Seems it's important to keep your Apple devices up to date

Wondering if you need to update the iPhone's iOS to the latest compatible version available.

Eg: About iOS 13 Updates - Apple Support

Update your iPhone or iPad - Apple Support

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Re: How do I sync my iwatch again?

What to do: If your Apple Watch isn't connected or paired with your iPhone - Apple Support

or

What to do: If you can't pair an Apple Watch with your iPhone - Apple Support

or

May be your WatchOS version needs to be updated using your iPhone, before it can pair:

Update your Apple Watch - Apple Support

If needed:

Apple Watch - Official Apple Support

All the best :-)