My kitchen knives lost their sharpness. Please give advice how to fix this problem. And an other solution for the future to keep them sharp longer!
It is difficult to say without seeing your knife, but one thing that might help is to use a honing steel. These are small steel files that you run over the edge of the knife to remove any imperfections and restore its sharpness. You can find these at most hardware stores or online. Another option would be to buy a new set of blades, as dull blades can also cause dull cutting edges.