When you sign up for AWS and subscribe to SES, they initially place you in sandbox mode, which comes with limitations such as a daily email sending limit of 200 and a sending rate of 1 email per second.

So, to transition to production mode, you need to apply and click on the Request production access button when logged into your AWS SES account.

On this form, you can choose between marketing or transaction options. Input the actively running website, which should have a privacy policy and be well-maintained. Additionally, provide a detailed explanation of the use case, describing how you intend to use SES and the frequency of your campaigns.

After that wait for email notification from Amazon Team, Mostly this took 1-2 days.