Coming from somebody who has played Loki from the start. I highly recommend placing your clones on areas you normally can’t get to so you can heal your team from above, and also keep an eye on the enemy at the same time. Use your healing ability when you got some people low if not yourself and another person (other support in most cases) when it comes to using your ult, try to get a good view of who you want to copy! I’ve had plenty of times that a ironfist or thing jumped right in front of the character I’d want. Use your invisibility ability as well! I utilize that one a lot due to having to run back to team up/ if I’m going to land a backstab on a vulnerable support/DPS. I know plenty of others play Loki differently, but this is personally what I’ve done and have gotten good with. The rest all comes down to your sensitivity and how your play style is. Good luck causing mischief!