What type of wear - cupping, feathering, straight or diagonal?
Is this since the alignment? An alignment can't "fix" previous wear. Could be the alignment is incorrect (it happens). Rotate the wheels to check for repeated wear.
Need more info. Pictures are good, too.
How many miles on the shocks and what brand and model (some last longer than others). Could be any worn part - have any front suspension parts been replaced?
Search "tire wear chart".