Retake if 1450 falls below the middle 50% at schools you seriously want, if your colleges superscore so a second sitting can only help, or if a scholarship threshold sits just above your current score. If none of those apply, your time is better spent on essays and the rest of the application.
1450 is the range where a retake most often pays, because it sits just below the middle 50% at a large number of selective schools while being close enough that a modest gain crosses the line. If your practice tests were consistently above your real score, a second sitting is usually worth one more cycle of preparation.
The full picture, with the surrounding detail, is in Is 1450 a Good SAT Score? Above the Top-30 Median.