This is something I used to really do well and now I have to relearn . Somehow I lost, "The Touch".
A sharp knife is a good knife, learn how to sharpen your own knives.
Get a couple of quality whetstones, they are cheap. Learn how to use them.
A dull knife makes an ugly scar and isn't useful except as something to take up space in the drawer.
You have some, I know you do. I do.
Here are some Youtubes that show you how to sharpen your own knives. Beware, this guy at the end has turned it into an art form but I am putting it up to show that all of it is technique.
The angle of the edge is very important!
Here is a good link for a text version,with illustrations. a real good primer.
There are literally thousands of methods and thousands of gimmickey little gizmo's.
Figure out how to do it as cheaply and quickly as you can,
A razor edge on a knife is not always a good thing, think of axes and chisels, sometimes you just want to cut something that is stubborn.