Can someone pls tell me why does my fork sound like this (should i be worried?)

yes

Hard to tell from video, but doesn’t sound right.

Sounds like it’s topping out.

Check your headset and make sure it’s nice and snug.

Make sure the axle is tight and brake caliper bolts are snug.

If everything is tightened down and the sound persists, you have the top out clunk. Not sure it can be fixed as lower end forks tend to have this behavior.

What type of fork do you have?