Hello. How are you doing? I'll be happy to assist you.
Will this support the attic only? What is the joist length on each side of the beam?
What is the city and state so I can look at snow loading?
Where along the length does the roof post land?
Where along the 13' span does the post land for the valley?
5.25" x 11.25" 2.0E LVL
4x4 doug-fir no. 2.
That is not a problem as long as the beam is centered on the post.
No. That needs to go to a post and to a properly designed footing.
I can't say for sure without knowing a lot more. I would triple it up and add a post below it directly below the post from the beam.
Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.