Which of these 7 factors increase the domain value the most?(number of letters, other extensions.

Which of these factors in your opinion, increase the value of a domain the most?

(Let's assume the domain is a 1 word domain, not a combined 2 or more words, but just 1 word)

if the .com version has been sold, for at least a minimum of $5000+

If the domain name is registered in 40+ other extensions

The amount of letters it the domain (5 letters compared to 8 letters)

Whether the domain name is a generic keyword

…

Which of these 7 factors increase the domain value the most?(number of letters, other extensions.