There are a lot of different things you can depending on your interest and the severity of your symptoms.
Stuff you can do on your own: physical activity (even if it's just going for a walk), mindfulness activities (e.g., meditating, yoga, coloring books, etc.), reducing anxiogenic stuff in your diet (i.e., caffeine, workout supplements, etc.), and making lifestyle changes (e.g., making sure to maintain as healthy of a work/life balance as possible).
If you're interested in professional help, therapy can be extremely helpful. It doesn't have to be the "tell me about your mother..." type - CBT (cognitive behavioral therapy) is very pragmatic and skills-based and is the most evidence-based psychotherapeutic treatment for anxiety there is.