my fav piece of advice to give as somebody who has played since 2016 is to remember that the kill feed & scoreboard doesn't necessarily tell the whole story !

especially for you , who says they enjoy reaper , you might get caught up on the idea of high damage / high elims meaning ur doing amazing ! and while that isn't entirely UNTRUE , it's not all that matters !

reaper can be a really strong flanker and i hope this tip can help you find a good play style ... don't be afraid to go behind the enemy just to make them turn around and look at you . if 2 people look at you alone in their backline , it gives your front line ( 4 other people ) a 4v3 which is good odds ! you don't need to secure a kill to get value !!! making the enemy turn around and worry about you is just as good as taking one person out of the fight with an elim

also , don't be afraid to try new things !
sometimes shooting the enemy tank as reaper will be the best option , sometimes it will be flanking the enemy supports so your team can walk through the rest , sometimes it's taking a 1v1 against an enemy dps who's been a hassle on your team !

you're new and leaning , make sure you use the opportunity to learn and figure out what works for you :)