how to shape and when to prune my Magnolia tree

in Plants
I planted this Magnolia on the Christening of my Daughter almost 23 years ago - then I moved house and had to dig it up- I put it in a pot and only planted it out about 4 years ago due to moving ... I really do not know how to start- despite it being 23 years old it is becoming shrub like and I really wanted it to become a tree - Any tips on how and when to prune/shape ? I have read it up but do get confused . I am new to gardening again ...
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In the 1st pic below, there is a very badly damaged /dead short branch.
Would recommend you remove asap.
Really need to see flowers.
Magnolia soulangeana can grow into large trees.
https://www.google.com/search?q=magnolia+x+soulangeana+tree&tbm=isch&ved=2ahUKEwiKt9HkioDvAhULWxoKHW7aCCQQ2-cCegQIABAA&oq=magnolia+x+soulangeana+tree&gs_lcp=CgNpbWcQDDICCAA6BAgAEEM6BggAEAgQHlD7IVjPK2COQWgAcAB4AIABfogBxQOSAQM0LjGYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=TP80YIrhO4u2ae60o6AC&bih=579&biw=1280&client=firefox-b-d
Looks to be about 6" long with no buds /flowers.
See trimmed pic below.
If it were mine I would be very tempted to remove the branch that is growing from the soil to the left of the main trunk.It would leave you with just one trunk.