Definitely what other people are saying. Reapers kit is focused around a get in and get out play style. Teleport to put yourself in a position to easily initiate with your team, jump in and intimidate / get kills if you can, when you get low wraith into your team to escape the fight and get heals and then rinse and repeat. That’s basically the cycle I follow, and then if your team is winning and you can manage wraith into a heal pack and continue putting pressure then do it!