You should strive to renew prior to the 7 years otherwise it’s the exams again. You’ll need to be assessed and trained by an ATO and have the test completed prior to that 7 years - but check the actual expiry date as it should be the end of the month in which the test was taken.
Be aware that if, in that 7 year period, you have held an ICAO instrument rating of any kind then there is some flex.
Where are you based now?