If you can find no competition keywords for luxury watches, go for it.
I just checked to see if I can find something for luxury watches and I found an angle in less than a minute. Please don't go after this since I'm making it public here but you can use this as a start to get your own ideas.
I typed in "do Rolex" into google and saw the auto complete. The third one was "Do Rolex Watches Have Batteries". This one is super competitive and almost every result on page 1 is targeting the keyword.
View attachment 205842
So now we use this question as a base to find other keywords that don't have competition.
So next step: "Do * watches have batteries" and place the cursor after the *.
View attachment 205844
So check out the third one. "Do Cartier watches have batteries".
Here's the SERP:
View attachment 205845
As you can see, it's really easy to rank for this since there's nobody targeting the keyword. The results on the page aren't really useful. Compared to the Rolex keyword, this is a joke to rank.
Tag Heuer is the same. The results are rubbish. You can use alphabet soup to find additional keywords like these.
You can use a similar process for any niche. If you're using AI, it's best to go after simple yes/no questions. It's much easier to write those with AI. Go for questions starting with "Is", "Do", "Does" etc. You'll find some good yes/no options.
I hope that helps.