A well-pressed print should outlast the garment it is on. Most that crack, peel or fade early were treated in ways that would shorten the life of any print, and the fixes cost nothing.
Turn it inside out
Nearly all the wear a print takes in a machine comes from rubbing against the drum and against other clothes. Washing inside out puts the fabric on the outside and takes the abrasion instead of the print.
Cold water, gentle cycle
Heat is what softens and lifts a print over time. A cold wash removes ordinary wear perfectly well, and it is kinder to the garment's colour too.
Skip the tumble dryer where you can
The dryer combines the two things a print likes least: sustained heat and constant tumbling. Hanging a shirt to dry is the single biggest thing that extends the life of a print. If a dryer is unavoidable, the lowest heat setting is much better than none.
Do not iron the print
An iron placed directly on a print can melt it in seconds. If a shirt needs pressing, iron it inside out, or place a cloth over the design and keep the iron moving.
Leave the first wash a day or two
Giving a freshly pressed garment a day before its first wash lets everything settle properly. It is a small thing, but it costs nothing and it helps.