Oh boy have I struggled with this myself. I've tried a lot of things.

1 Gratitude.
This is going to sound cheesy, but gratitude is the single thing that's helped the most. Try moving through your day reminding yourself what you are thankful for and your immediate environment. The food you eat, people, pets, nature, hell - even the air that you're breathing right now. It doesn't really matter what you're thankful for, but it has to be genuine and specific. Make it a game in finding any little thing to be thankful for. I've found that it is virtually impossible to exist in a state of gratitude and anxiety at the same time.

2. Grounding
Walking barefoot on the grass or bare Earth grounds us and helps us feel more centered. It's not an immediate fix, but a practice.

3. Sungazing
This makes the single biggest difference for me. Limit it to only 10 seconds at first. ONLY look directly at the sun within 1 hour of sunrise or sunset - be er in the middle of the day or at any other time. It helps with melatonin production and sleep, and you will feel better the next day. You don't even have to do it every day. I do it when I'm feeling especially down or exhausted, and I swear every time I have an unexpectedly good day the next day. Did you know that your pineal gland has non-visial photoreceptors (meaning that these non-visual photoreceptor cells are meant to absorb light, but are not used for seeing)? You can look up the science on that; it's real.