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Square breathing it's like four seconds in hold for four seconds then four out.
Mainly helps prevent panic attacks tho

I'm a huge fan of guided meditation and breathing. If you look up some basic mindfulness exercises you'll find some cool ones.

I like visualizing myself somewhere safe (for me I do the beach but it could be anything) and you try to visualize and place your senses there (i.e. What does it feel/smell/etc. like?)

Anything sensory you can play or fidget with (i.e. Playdough, stress balls, even a bracelet)

Lastly, maybe it's a small quirk but I really like feeling my heartbeat with my fingers. I find that when it's racing, feeling it helps me to actually bring it down?

Meditation and exercise are wonderful for that.

Also, journalling can help get rid of any thoughts you're having that are triggering the anxiety.

Fidget spinner works

Playing online games when i feel lonly or being with family helped me

Coconut water