Ok I got it @feditips ... If you want to see first post of any user

append to URL:
?min_id=0

This gets to the 1st post of any profile!!

:) I actually got this from Gargron via search engine gigablast.com
(after about 10 searches)

https://mastodon.social/@Gargron/102623104474536870

So my first post is below!

https://qoto.org/@freeschool?min_id=0

(press END button after to jump to bottom where first post is)