discuss Help For 6N.com-Please

One suggestion is that you could go to various platforms to see which letters are most popular, or what kind of domain name is most popular. Combined with historical sales records and search engine keywords, you may probably know what you want.

101 is good and 88 is lucky number for prosperity and money
Paires are good like 2200 etc
Unlucky numbers are 13, 4 and 5 .
In East Asia, some buildings do not have a 4th floor
5 is associated with negative connotation, 55 unhappiness.

Only .com, .cc, .cn are valuable for this kind of domains , the shorter the better.