Ill looking Magnolia tree

We've been in our house a year and this summer one of the main branches of our magnolia tree seems to have died. Can anyone advise on how we should remedy and any tips for future care? I'm a complete novice gardener so any help will go a long way. Thanks.
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Can you do some close ups, and especially of the base? If it's in a compromised position in terms of how and where it's growing, it may simply be drought