I certainly would have socialized Simba more. I realized that it was needed more when I got my second dog (Nala) and even more so with my 3rd and 4th.

Simba has always had issues with new people - except for my dad and I. I really didn't know how to correct it at first but as we grew together we learned how to work together. I did pretty good back then for a 10 year old.