If your coverage has lapsed, you would have received a notice form the insurance company of your lapsed coverage and what you need to do to get your coverage paid up to date and "In Force".
You can contact your life insurance agent or the insurance company direct.
They can review your insurance policy and determine the amount of money you currently owe and need to pay in order to get your life insurance coverage back.
This is called "Reinstatement" of your life insurance policy. Once you have reinstated your coverage, your policy will be "In Force" and providing you the protection you need.
Learn more about what to do if you have a lapsed life insurance policy.