Bellinger at 28 is a guy you can commit to long term, especially since he can move to a corner OF spot, 1B and DH as he ages or when PCA comes up.
They already have Swanson locked up, Hoerner and Happ for a couple more seasons, adding Bellinger and maybe even Candelario would be a smart move. Then surround them with the top prospects coming up like PCA and Amaya that there now and they got something going there with the position players.
Morel and Madrigal is also a good start for the bench