If your LTV reaches the Liquidation LTV shown on your Credit Line, your Credit Line is closed and all of your collateral is sold to repay what you owe. This can happen without warning if prices move fast.
We try to warn you by email and push notification when your LTV gets close, but a warning may not reach you in time, so keep an eye on your LTV.
To lower your LTV, add collateral or repay part of what you owe. You can't do either once liquidation has started.