Perhaps a colored door if you paint the home grey. Maybe Red? You could simulate a color change on door by hanging something over the door that is the color like a tablecloth or piece of fabric. If you search houzz for" grey homes", you can see what others have done. My home is painted Cape Cod Grey with white trim and it has been very easy to live with for years. I have a dark grey roof.

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I don't seem to be able to add a pic :(

Like your house! I think the verticals in the window on the left are vertical blinds - get rid of these - they are very dating. Paint the horizontal safety bars to match your other window frames. I think the house just lacks privacy - and this then necessitates curtains and blinds at all the windows, giving the house a closed off look. I would get rid of all the very solid and 60s era conifer shrubs and replace with softer planting and one or two taller trees. Perhaps a fence or hedge to provide privacy so those windows could be opened up to the sun and garden. Or you could plant a row of spaced standard trees (fluffy heads on trimmed trunks) (eg robinia, or a weeping standard poplar or willow) you'd only need about 5 along the street frontage, creeper round that letterbox, a few pretty plants next the house. Then open the blinds and curtains. You could add a screened courtyard outside the glazed area on the left. Talk to your local garden shop for ideas. I cant tell whether the walls are brown brick or brown Summerhill stone (thats those rough concrete bricks, also very 60s). My house is Summerhill stone and has been painted cream - looks fine and certainly removes the 60s look. Hope this gives you some ideas - good luck with your new house.