You normally need to wait five years since being granted Pre-Settled Status. Your Pre-Settled Status certificate will state the date when you can apply for Settled Status. You will then need to submit a new application.

However, if you can show that you satisfy the five-year residence requirement sooner than is stated on your Pre-Settled Status certificate then you can apply for Settled Status as soon as you satisfy that requirement.

If you decide to do so, then you should be prepared to prove you have lived in the UK for five years and provide documentary evidence.