If you don't think there's a major underlying issue, Toastmasters is perfect. You just need to get used to meeting people and practice breaking the ice and you

If you don't think there's a major underlying issue, Toastmasters is perfect. You just need to get used to meeting people and practice breaking the ice and you should have no problem. Do everything you can to get experience with this until you feel 0 reticence. You don't necessarily have to start inviting random people to lunch, but being able to break the ice and being comfortable around new people is important. Other people are feeling that anxiety too and it's stopping them from getting out what they want. Practice until you become so good you can put the room at ease and make it easy for others to get out what they want to contribute and your skills will be highly valued.