You just bought the home. Move in. Live there for at least 6 months before doing anything major. Learn how you will live in your house and how well it functions, Make a plan based on your findings. Figure out your furniture style, your color palette, your budget and your plan of attack. You live on the inside, the outside is made nice for the neighbors to see.
Take care of the inside first.
If you feel you need to do something on the outside I would just paint the dark brown to match the lighter color on the top of the house.
Not a perfect rendition, but will give you an idea of what it would look like.
Lightening up trim can really make a difference. I had dark brown trim on my last home and changed it to white - added a piece of trim over the garage door and painted the space over the garage to blend in with the stucco.
Before and after:
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