The simplest and most cost effective way to make a stronger chain link fence is to add line posts. They strengthen top rail support and reduce top rail sagging. We strongly suggest this option if 1) you plan to add privacy slats or 2) your fence will have snow piled near it (NEVER on it) or 3) your fence has long, straight runs where top rail sagging can become more obvious.
If your fence is going to be pushed a little more than usual larger Posts and Rails are the answer. They cost a few dollars more per foot but it’s less expensive than replacing the entire fence in only a year or two because it wasn’t strong enough for its particular application.