How to stabilize the ic temperature when working full load

[KAKU]

Hi, amazing people!
I was thinking about how to stabilize the ic temperature when working full load. Now I have thoughts below, but I want to ask for a personal opinion. According to testing on Youtube Can ic xl4015 (with the use of constant current 5A) or lm2596 (with the use of constant current 2A) be separated from the default board and then extended pinout the legs ic using a good cable and then attach it to a heatsink that has the fan? For example, it is affixed to an old VGA card fan heatsink where the power to turn it on comes from the input power module. I mean that the 3.42A / 19V (laptop charger) power source is coupled to the IC 7812 input (with a heatsink) then outputs the IC 7812 to the VGA card fan.
And here is a reference to LM2596:https://www.utmel.com/components/lm2596 ... nt?id=287
It seems to be a little bit helpful.
Maybe, I think it is too complex. But I still hope for some discussion!
Thanks in advance!