What move do I make next? Championship Contender?

8 - 3 Standard league I thought about packaging Kelce and Murray or Olsen and Murray any advice would be appreciated!
QB - K. Cousins
RB - L. McCoy
RB - D. Murray
WR - Mike Evans
WR - M. Thomas
TE - T. Kelce
Flex - D. Baldwin
Bench - G. Olsen, A. Rodgers, T. Taylor, R. Burkehead, J. Connor, M. Williams