In Audienced, you can change your plan (Starter / Grow / Scale) at any time directly from the dashboard. The change is applied without losing any data or settings.
In the admin dashboard, go to:
Subscription → Change subscription
On this page, you can see:

After confirmation, the plan is updated according to your billing cycle.

The exact effective date is visible in the Subscription section.
Changing your plan:
If you exceed allowed limits after downgrading, the platform will clearly indicate this.
When changing your plan (or separately), you can also:
Yearly billing is more cost-effective and is charged once per year.
If:
the system will prompt you to complete the required information before allowing a plan change.