All 4-letter .com's were taken as of 2013.

https://whoapi.com/blog/we-are-out-of-4-letter-com-domains/

I wonder how long until all 5- and 6- letter are gone.

Exactly, I too had to use .net & .us, because.com was registered in 1995.

My last name ends in al but the domain is taken. The .com one is taken by a guy who’s using it to showcase his Holocaust family tree (oddly enough his son had a run in with my sis a while back). I tried reaching out to him to see if he was interested in taking like .org but he’s not :( so I got .me