i think ive even used it in scenarios where im the only guy. in informal conversation i will go to yall. being from texas its just normal. seems kind of weird to say yall in a professional setting but i guess being from texas would give me a pass.
all is my alternative that i try to remember to use. seems less awkward than everyone but still seems weird.
team is one i used heavily in emails especially at my old job when it was exclusively all coworkers. seems like this would be the best choice even when its not all coworkers as its welcoming and positive. i might try it next time and see how it feels.
i think i do fine in email conversation in sticking with all or an alternative but when i am speaking im less confident so i just blurt out what comes to me. i think a way i try to overcome my nervousness when talking is by being friendly and thats why guys is what i go to which obviously has the potential to be offensive so yeah need to stop that.
according to google here are some alternatives hey team hey crew hey all hey folks hey people hey peeps hey y'all hey everyone hey pals hey friends