As others have said, it'll be virtually impossible to make a Ricky Williams trade for a generational quarterback.If you think Lawrence is the QBOTF, you trade what you have to. You go full Ditka.
The only options are to either have the worst record in 2020/2021, or to predict which teams will have the worst record in 2020/2021 and trade for their first-round picks this year.
Bill would have to hedge his bets in case Lawrence returns for his senior year.
Being able to predict which teams will have the worst record in 2020/2021 and managing to trade for their first-round pick would be like trying to win the lottery. The teams that expect themselves to be terrible are unlikely to trade, so Bill would likely end up only trading with teams that think they're going to be good in 2020/2021. The only way those teams would end up with the worst record would be from injuries to their star quarterback and star players, which is impossible to predict, so Bill would deserve to be called a real-life genius if he could somehow manage that.