Push yourself to regularly do some of the things that you avoid doing because they make you uncomfortable. For example water cooler talk used to be hard for me

Push yourself to regularly do some of the things that you avoid doing because they make you uncomfortable. For example water cooler talk used to be hard for me as it felt really awkward. So I would regularly try to strike up a conversation with people despite being terrified. The big change for me came when work wanted me to do some presales and face to face meeting with clients. It was hard but very worth it, now I have successes I can point myself to when things get bad.