Dynasty trade (Swift for P. Williams/1st)

Thoughts on trading Swift for Preston Williams and a 1st rounder next year. It is a 12 teamer/PPR.

I am not competitive this year. I used a 1 of my 1st rounders to grab Swift this year. Currently my starting RBs are Ingram, M. Brown and Swift.

I put it out to the league, I am up for a rebuild and a couple teams offered up trades for Swift. So, I know he has value. How much value at this point?