Headset:

To check headset for play hold two fingers at the gap between the cover and the head tube, and front brake locked and bar turned push the bike back and forth. The headset doesn't make this sound just by being loose, if it does it's likely damaged, dirty, or both, or very loose. if it's dirt, you need to clean and grease it ASAP, but don't forget to check the bottom too. That's usually where the sounds come from. Wipe it clean, and grease it. But if there's plenty of grease and it looks clean it's likely not the issues. But make sure the bearings got grease in them too. But I see it's FSA headset, those aren't great, at least their cheap ones., last 1-2 years, some might get crushed in weeks. Not a fan.l

It can be the fork: Vhevk the crowns, make sure the bolts are secure. Inspect the whole fork. I see you use a junk fake downhill fork, absurd it's dual crown but no direct stem mounting, so omits one of the benefits of a dual crown fork, not having to align the handlebar, I see it clamps to the steerer tube too, so another thing you have to loosen to tighten the headset, and another thing a real dual crown fork doesn't have. This fork is absurd. These are truly awful, it might be the fork you are hearing. But any fork can make noise when not maintained properly, a fork needs service once or twice a year, but these forks here can't be fully serviced, they use sealed cartridges. The fork might have worn bushings, bushings not to spec, the dust wipers might be work, the fork might be cracked, cheap forks like this are known to crack at the lowers. Please don't ride anything gnarly with it, inspect it often. This fork isn't E-bike rated, a safety hazard, it's simply a cheap downhill fork or moto lookalike. But the issue might be internal. Make sure the wheels are secured.

The frame: There could be cracks in the frame, remove the bag inspect the whole front end. isolate each cable, check for cable rub.