Manually Upgrade Members For 30 days Non recurring

Hey Guys
I am using s2 member free version.
My basic idea is to offer free membership for all users.
These free users can access my daily posts.
I will then have optional premium packages.
A user will make a payment at the bank or via an independent payment link.
We get the order, then we manually upgrade the free user to a 30 day non re-curring package where they can access daily premium posts.
After 30 days, the user is down graded back to free user.

So far have done the free users.

How can we manually upgrade users to this 30 day non rec-curring package?

We not using any payment gateways. Just free membership, then we upgrade users manually who pay

Any one pls help. I really appreciate

Go to user’s account as admin and change the level of the need user. Also set EOT time (put “+30 days” there). That’s all.

Thanks a lot, i really appreciate