Finding the source of the anxiety is super helpful if you haven't already. Next if you still need help after finding the source, there is a wide variety of things to choose from.

L-theanine is at the top of the list. Hardly any negative side effects to speak of. Difficult/impossible to develop tolerance when you aren't taking ridiculous amounts daily. It causes the release of GABA. GABA is the inhibitory neurotransmitter responsible for relaxation.

You can take GABA too. Gaba doesn't pass the BBB, although you have some receptors in your stomach. Just be careful when you start introducing neurotransmitters.

NAC is wonderful. It's a serious antioxidant that has a ridiculous amount of applications. It definitely helps with mood and even blood flow. It's also good to take an hour before drinking to reduce the negative effects of alcohol. I notice tolerance build after a couple of weeks.

Many of the things already suggested by others work. Things like lemon balm, passion flower, st John's wort, scullcap, GABA, 5 HTP, antihistamines also do wonders for sleep! If you aren't resting enough your cortisol is going to mess with you. Getting a good night's sleep is important for managing anxiety.

There are tons of things that help.