If you would like to switch to a different Pipedrive plan or change your billing frequency, you can easily do so at any time in your billing cycle by going to your Billing tab and clicking on Manage subscription.
From here, you will see the option to toggle between the Essential, Advanced, Professional, or Enterprise plans, or switch between Monthly or Annual billing cycles. Click on Proceed to checkout to confirm your change.
Your billing may be updated to reflect the changes you made. You can read about what happens to your billing when you switch to a different Pipedrive plan in this article, and what happens to your billing when you change billing frequencies in this article.