I think you have a good plan - pretty cool looking house!

Some visual

With gray/bronze/charcoal trim

less contrast trim

Wow! Thank you so much for the visual. Is that just a paint program you're using?

I use photo editor

I think the left side needs to be the same color as the main body of the house (to lessen the ‘church like’ look you have now).

The trim needs to be the same color as the siding and the siding needs to be a closer match to the brick. A contrasting trim color makes it much too busy.

I had the thought today about moving the shrubs (rhododendrons) under those middle windows somewhere else. There's so much roof and because you see such little siding, I feel like it makes the roof line look even lower.

Stay true to the original design intent of the house style. It is a shed-style home from the late 70's early 80's. Your siding is in great shape. Keep it maintained. I would re-stain the white trim back to gray and be done with it. Add pops of color at your front entry. Trying to make it 'more contemporary' such as 3 types of siding and etc will take away from the inherent look of what that house IS....a shed style home.