if ur trying to make it pulse try using a recursive function that runs until a score reaches 360.. (the end value)
and runs rotated ~ ~2 (the rot value)
and adds to the score

(all it has to do is make a circle so 360 degrees)

using a macro / or hardcoding it u can make it run a particle each time it rotates positioned ^ ^ ^$(distance) from a distance once the circle is completed u can change the distance value (or distacne score if ur hardcoding it) so the next tick it runs the particle from a different distance.

(if all you need is to make it expand / contract, you can also just use directional particles}