I deleted Diablo off of my ps4 awhile back and I would like to start playing again i had a lot of high levle characters and was wondering if I can get them back or if i have to start all over again.
if you deleted the game save, as well as the game, then they are lost. if you kept the game saves but still deleted the game, then you should be able to resume.
however, if you had Ps+ and still have it, you may have a cloud save of the game.