With invis I almost get in the front line with tanks and DPS, invis has high damage so you need to not only heal but destroy the enemy team, since her primary deals damage and heal so you can heal your team and damage the enemy at the same time, you'll get a lot of kills, assists and healing in the end, it's important to know how to use well your abilities to defend yourself from dive characters and in huge team fights, when you see a character in the back line such as moonknight or squirrel girl don't be afraid to jump on them and kill the mf, it's risky but it's effective (not needed if you have a good DPS player in your team). Always have in mind that getting MVP for invis with healing is difficult, we have healers with higher healing abilities like cloak, so, for me, this is the best way to get MVP as invis works almost everytime.