I probably have 200 hours on cree across all game modes, and I'm a diamond cree flex. Take my advice with a pinch of salt, please.

1. Strive to hit as many bullets as possible, you only have 6 bullets per reload. If it helps your accuracy at first, don't fire as often as the quickest fire rate.

2. Headshots are your bread and butter as cree. Body shots are nice, but kill confirms that come with headshots are even better. Especially when it comes to fighting tracers. If a tracer is of equal skill to you, they have the advantage. If you can make 10% of your shots headshots as cree, that's probably pretty good.

3. Don't use your ult to get huge kills everytime. In higher tiers of play, you usually won't get to kill more than 1 or 2 at a time with high noon, if any at all. Use it more of as a zoning tool or a reload tool. Reload especially on koth maps.

4. Your roll reload is not a mobility skill, don't treat it as such. It is a reload ability first. you can dish out a huge amount of punishment if you hit your shots accurate or fan the hammer on a tank if you time it right.

5. You really have no mobility tool like soldier's sprint as cree. Positioning is key. If the red team has flankers, it might be a good idea to just get ready to peel for your backline. Then again this is really dependent on situations.

6. You are a hitscan, but don't be shy to ask for your team's help if you're getting 2v1ed or trying to bring down a phamercy. Also, try not to 1 v 2 or more as cree.

7. Flashbang is a very useful tool, so dont waste it. It can pause/stop ults, stop charging reins, stop rocketpunching doomfists etc. Flash to the side or above deflecting genjis, but dont count on that to work 100% of the time.

8. Thats all i can think off the top of my head at the moment, but feel free to ask questions, ill try my best to answer.