How do I solve this problem for under eye hollowness? I have tried Restylane injections.

Hi @seattleguy2018! I recommend PRP injections. PRP which stands for Platelet Rich Plasma is a natural and non-surgical solution to treat under eye circles and bags. PRP is highly effective for restoring sunken eyes. Generally, two vials of blood will be collected from the patient and placed into a centrifuge. The centrifuge spins and separates the platelets from the rest of the blood components. The plasma contains the valuable collagen and growth factors from the rest of the blood's components. The plasma is then drawn up into a syringe and injected in the tear trough area. Typically, 3-6 sessions is adequate for optimal results. Best of luck, Dr. Nima!

Filler injection are usually the easiest option.  Another option is transpose eye fat if there is enough eye fat present. Other options includes soof lift or even implant. Best to have consultation to determine what's best for you.

Under eye hollows can be permanently corrected with surgery or temporarily camouflaged with fillers (Restylane, Belotero, Volbella).There are great non-surgical options to fill in under eye depressions and hollowness. Using dermal fillers, a liquid eye-lift can be performed. A dermal filler such as Restylane would be placed in the cheek and tear trough to hide the depression or bag underneath your eye.
Surgery would require a fat-repositioning lower lid blepharoplasty. In this surgical procedure, fat from the eye area is moved into the tear trough depression filling the actual depression. 
I hope this helps!