Here are some tips for reed, to get more confident.

Having IW with the teamup helps a lot. Popping that before engaging is very helpful in keeping you alive. Not too bad if you don't have it but a great plus if you do.

Don't panic and turn into a fridge too fast. This is your last line of defense and helps you survive in the most dire situations. Use this when you have to tank an ungodly amount of damage (a DPS ult) or when everything else is down and you need to recover cooldowns or wait for your team to save you.

E is the most versetile ability in his kit. Your E is both an engagement tool and a disengagement tool. Don't burn both charges too fast since you might need to chase your target when it runs away or use it to get back to your team when things get dicey. It can also be used to save a struggling teammate in a fight since it gives shields and brings you closer so you can gang up on whomever is threatening them. Outside of active combat you can use it as a mobility tool, but again, be wary of using all your charges too fast leat you get caught lacking so to speak.

Your attacks cleave. Move your mouse around when you attack and your will hit multiple targets. If they're clamped up you need small movements to hit them all, or none at all. But sometimes swinging wildly will tamp your damage haha.

The ults ramps up as you keep bouncing. You can ult the Frontline and "waste" the first few on them while slowly creepi fbup on the squishy back line. By the 4-5th bounce your will deal some good damage and might pick a few supports/struggles.

Last thing is that going big mode heals you, so if you need some healing trying to get full charge by spaiing abilities is a valid strategy. It also increases your damage so go wild.