Ok, I can imagine a few paths forward from here.
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Practice on a cube, are you able to select and rotate UVs on the side of a newly created cube? Extrude the cube and continue to experiment with the UV editor, leveling up your knowledge to the point where you have a deeper understanding of this tool and are able to apply knowledge to the roof.
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Post a step-by step guide to recreate your shape. (You’re saying you drew an upside-down V in freehand basically?) - I’ll try to recreate this on my end and try to rotate uvs.
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Export the mesh as an .fbx and post it here.