FWIW - the Spotrac website attempts to calculate the market value and provides a guesstimate about a player's next contract.
For Taylor, they are projecting a 4 year, $52M contract or about $13M per year.
They used Ezekiel Elliott, Dalvin Cook, Derrick Henry and Nick Chubb as the player / contract comps.
https://www.spotrac.com/nfl/indianap.../market-value/