Members Plugin or Hook help please

Hi,

Im looking for a plugin that will automatically upgrade a members role.

Basically Im making a competition site, Members join as either a supporter (where they can just vote for videos) If they enter the competition they then become a contestant. If their entry is in the top 100 they are then accepted as an academy student.
Im using a post vote plugin and a user role editor (WTI Like Post and WPFront User Role Editor) to vote for videos and manage roles.

The idea is, after a member Add’s a post – which is then approved by admin, the members role will then be upgraded to Contestant. The user is then emailed stating their post was accepted (using the user submitted posts plugin)

I dont know how hard this will be to make, But a function that will.

Upgrade Author role on post approval to Contestant

On Post page options for admin to Upgrade contestant role to Student or Delete Post (If delete post then update user role to Supporter)

I would like them to also recieve a custom email explaing their role change.

Can anyone please help me with options on how I can achieve these functions please