First - repaint with modern colors.
Gray, ivory and beige are pretty standard.
But this year's "it" colors are purple, olive green and sage.
Next - change those light fixtures.
Really "in" this year are pendant lighting, Edison bulbs or simple recessed lighting.
Third - update your hardware.
New door knobs, drawer pulls, locks and handles can really give an updated look.
Fourth - reface your appliances.
Use peel and stick stainless steel or marble contact paper to give those old or yellowing appliances a new look without replacing them.
Finally - this is my favorite.
If you can't afford a new front door, install a kick plate.
A new kick plate is an instant way to add visual appeal.