Yes on reseeding. You’ll never get rid of it in one season . You’ve got to get all of the seeds . You really need to spray it now to kill it . Do not use any weed killer on seed or new seedlings . Then reseed and hope the grass comes in thick enough and establishes a strong enough root system to choke it out next summer. And apply the pre - emergent when the forsythia are blooming in Napril.