If the shell of your ski boot is still in reasonable condition then yes, there are options to extend the life of your boot.
To check, first examine the condition of the soles of the boot to ensure they have not worn too thin and that the plastic shell has not cracked anywhere.
There are a selection of models – the Dreamliner is a great replacement liner for any Alpine ski boot. The Pro Tour is the best for a touring boot as it has laces and an articulating cuff that will move with the boot.
The Powerwrap and Godiva are both wrap style liners which can work great for larger calves and solving shin problems. Intuition liners can be heat moulded over and over and therefore moved from shell to shell.
Foam liners give you ultimate control
Foam liners are another great option to giving you the ultimate control when skiing.
Foam is injected into the liner and will mould around the foot and shell giving a very precise fit. When it sets it becomes very dense so movement is directly transferred to the ski.