Keep pushing like you are. Remember every second of a conversation you have you are pushing through and that's a mini win
Right down why you are great and stick it on your mirror or carry is around with you in your bag and read it's every morning and every night OUT LOUD! you will feel stupid at first but gradually you will feel less silly and soon enough it will be easy for you and then you can start believing it
Controversial opinion but doll yourself up. Get your hair done, get nice make up and clothes and perfume. If you look good you will feel good and gives you one less thing to worry about when in conversations or meetings.
Walk with purpose. Wherever you are walking don't just walk slowly if walk faster than usual and with good posture this will make you feel powerful
Where the colour red. It it's a fiery colour it can give you some added oooommmph!
Drink water keep that brain hydrated
Practice introductions and conversations in your head to you know what to say it will help you not be so stressed before a meeting etc
Laugh at yourself or just try randomly laughing. Again you may feel silly at first but just do it - Dane with singing
Get excercise in whenever you can especially things like yoga and Pilates.
Practicing deep breathing and breathing techniques. Have a look on YouTube
And get your self some nice Pajamas, lavender room sprays etc to keep you relaxed before bed so you wake up feeling good to start with - oh and plenty of sleep