Gronk ROS and keeper question

in a 4 keeper league. Kept Gronk from last year. I would need a miracle to win anything this year. Trying to decide if I can trade gronk for a decent draft pick next year. Is his career basically over now? outside of week 1 and like 1 catch a few weeks ago he has been a bust.

Do I trade him (if I even can) or hold onto him as a keeper and hope for the best next year.