Coming from a 400h Gold-Plat Genji main. When you dash up, always keep a mental note of your enemy’s position, that way after killing one target you’ll know where to target next, because your next target won’t be too far from their last position. DO NOT TARGET TANKS FIRST, they will take away your precious time on your Dragonblade. Pull up your Dragonblade not on the beginning of a fight, but in a middle of a team fight when both team is engaged with each other that the enemy team is confused. IF you want to start a fight with your Dragonblade, make sure that your whole team follows up, either with Ana’s nanoboost, Lucio’s speed boost, Zarya’s bubble, etc.
If you get disoriented too much, it means that there’s something wrong about your sensitivity. I myself is a very hi sens Genji player but that’s the sens I’m comfortable with.
If you’d like more I have put up an in-depth Genji guide, you might be interested in taking a look at it. https://us.forums.blizzard.com/en/overwatch/t/in-depth-genji-guide/326434
LASTLY, AND THE MOST IMPORTANT ONE: Practice and watch Genji streamers like Water, Cavalry, Necros, etc. I’m sure you’d pick up a lot of Genji tricks like how I did.
Good luck!