You've probably heard this a thousand times already, but meditation can be extremely effective if you aren't already doing it. For me, it's been life-changing.
It takes time, though. Many people try to meditate for 5-10 minutes a day using some kind of app, only to be disappointed and ditch it after a few weeks. The thing is, it's kind of like training a muscle at the gym. You need to put in the time and consistent effort.
I had a passing interest in it for years. Every once in a while I'd do a group meditation, or try some guided meditations here-and-there, and found it to be nice but nothing significant.
Around 2 years ago I decided to really pour myself into it, meditating consistently each day and going on a few retreats. And I can finally say that now I get it. I've seen real benefits in my life, how I handle stress/anxiety, and how I relate to other people.
Your mileage may vary of course, and there are also several different approaches and methods. I personally dove into Buddhist philosophy and techniques specifically, but there are other systems you can follow if that's not your thing, ranging from certain religions to completely secular.
If meditation simply isn't for you, then there are still plenty of activities that make you more mindful and bring you into the present moment. Really anything that you do with your hands that requires focus will be beneficial, and help you get into that "flow" state. Cooking, gardening, drawing, painting, woodworking, jewelry making, scrapbooking, playing an instrument, etc.
And of course, physical activities are always beneficial, specifically outdoor ones. Running, hiking, biking, walking, kayaking, etc.
All of these things bring you into the present, and produce endorphins, regulate serotonin, and do all sorts of positive things for your mind and body.