If your coilovers have seized, don't fret! There are a few ways you can free them off.
Firstly, try spraying some WD-40 or similar lubricant onto the seized parts and letting it soak in for a while. This may help to loosen things up.
If that doesn't work, you may need to disassemble the coilovers so that you can access the seized parts more easily. Once they're disassembled, you can try using a hammer and punch to gently tap on the seizing parts until they break free. Be careful not to damage any other parts in the process!
Once the seizing parts have been freed, you can reassemble the coilovers and hopefully they'll be good as new!