Subscription plan estimate

Hello, I have an inquiry about a decision for a subscription plan, right now I am currently using Scale Fixed plans, I need someone to help guide me which plan should I go for or any rough estimate or plan considering I will be having next 1.5 Months:
.5 Million to .75 Million Requests for 100,000 Users.

Thanks.

Have you looked at the billing estimate calculator on the Analytics screen?