I'm worried about hollowness under my eyes. What procedure would be better than fillers?

Lately, I've been concerned that my under-eye area looks much more sunken than before, so I'm looking into procedures. I'm worried because the area under my eyes looks hollow and tired, especially when I take photos or look in the mirror.

At first, I simply considered getting under-eye fillers, but after doing some research, I found many warnings that the area under the eyes is one where you need to be careful. Since the skin is thin there, it can become uneven, and there are also opinions advising against it due to side effects or the duration of the results, so it is difficult to make a decision right away.

So I am looking for alternatives to fillers, and I am wondering which procedures are effective for hollow under-eyes. I have seen treatments like under-eye fat repositioning, collagen injections, skin boosters, and Rejuran, but I am not sure what the differences are between them.

What procedures do people commonly get if they want to improve a tired overall impression and have slightly sunken under-eyes like me? I am looking for a method that adds volume naturally without looking artificial, so I would like to hear reviews and recommendations from those who have actually received the treatments.