We have only a small sample size for this year but here are Ben's attempts per game this year and in JuJu's two good years
2018: 42.18 (Career High for Ben by a lot)
Ben's yards per game are also down. They just aren't throwing the ball as much as peak JuJu years and he's the one suffering. He still leads the team in targets but that is largely due to Johnson missing time. I think the biggest glaring number is his yards/reception.
2020: 8.4 (!!)
That is a huge drop-off. His ADOT so far in 2020 is down to 4.7 from 8.8 in 2018 and 9.7 in 2019. I haven't watched a ton of Steelers games this year but why are they not targeting him deep? Is he not getting YAC? Either way, I would be looking to sell on the name. If the Steelers are ok with him being the underneath move the chains guy while Johnson and Claypool get the more valuable targets, he's not going to return draft value this year.