A few bowline knots...

Just a few bowline (pronounced 'boh-linn') knots, a knot with a fixed loop at the end of a strand of cord/rope.  Here I've shown some loosely tied with paracord, and then tightened/applied.

There are a number of other variations (something like 55 different ones going by 120 different names) of the bowline that can be tied.  These few examples I tied here are diagrammed in 'The Directory of Knots' book by John Shaw.

Each bowline can be further secured with a couple of half hitches or a double overhand knot tied around one side of the loop, as shown in one of my photos...

And pictured is an example of how I might use a bowline knot/variation with paracord for edc (everyday carry) with a knife, flashlight, keychain, multitool or whatnot.  I made a simple single strand paracord lanyard with a water bowline at one end and at the other end tied a fisherman's bend onto a small carabiner.

Alternatively you could make the bowline loop larger and run your belt through it or ring hitch it around a belt loop, or add a gate clip, carabiner, snap hook, switching up attachment options....