I came across this useful guide on how to price your domains so that you can sell them for millions.
Basically you need to do your research on what will you think will sell. I personally stick to generic keywords that describe your niche.
For inspiration I found a website quoting 60 millionaires in the Domain Industry.
The link to the guide is as follows:
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UKWebDesigners/UKDomainBrokers Offers Digital Marketing, Website Creation, SEO, and Domain Brokering.
An open platform that invites contributors and domain sellers serves as a dynamic marketplace where a diverse range of talents and offerings can converge. This platform acts as a collaborative space where individuals or businesses can share their expertise, creativity, and products with a broader audience.