The most valuable things you can do in this regard are to eat quality food, exercise regularly, and get enough sleep. If you smoke, stop. If you drink, do it in moderation or quit. If you consume added sugar minimize it as much as possible. If you do just this much you are way ahead of the majority of people.
Creatine is one of the few things that I recommend. It's one of the most widely studied supplements out there that's actually, consistently, been shown to produce improvements in athletic performance. It's safe and largely free of negative side effects (especially if you don't do a loading phase, which isn't necessary). They are now finding that it may have cognitive benefits as well. It used to be so cheap as to be a no brainer. Unfortunately, the quality brands all seem to have gone up by 2-3x since the pandemic, but it's still on the cheaper side. As with any supplement, you are unlikely to get startling results, though if you have been a long time vegetarian the results are likely to be more pronounced.
If you're working out make sure you get enough high quality protein. I think that a lot of people overdo protein shakes and things, but they can be an easy way to bump your protein up without consuming a lot of calories and with little effort if you pay attention to ingredients.
I'm not big on supplements unless you know you have a deficiency. People in the modern world are often deficient in vitamin D, especially if they live in northern latitudes and/or spend all their time in doors. It's possible to be deficient in almost anything but D especially can have a big impact. Magnesium is often low for the average American (YMMV if you are from somewhere else). You can and probably should get tested to see if you have any deficiencies if you are concerned or really interested in optimizing your health.
There are a few other things that might be useful, but you are definitely stretching into the experimental biohacking territory for most of them and it will require more research on your part than asking the Internet, if you want to go there.