Practice with an eye to perfecting a technique, will help a lot. If you were around here, I'd be glad to help coach you, but the best I can say from here is, learn to use one of several different types of sight pictures, depending on your style of barrel sights, and then practice.
There are a couple of other options- The first is a tube sight (scope with no glass), Second is a tang sight with a front globe using a crosshair insert. I used this for many years, until one day when it just disappeared.