You want to be careful. The house looks fine as is. Curb appeal brings people in but does not sell the house. If the siding is dirty clean that up if the trim needs painting get it done.
Get after the lawn as soon as you can and get it looking the best in the area, pressure wash the walk and step..
Any thing in the area that has caught your eye, snap a picture and we could discuss the pros and cons of changes. You don't want to go above the neighborhood.