Use a forehand grip and reach up for a high contact point.
Good overheads require good preparation. You can’t expect to hit hard if you leave everything till the last moment!
Not everyone hits the same. Let’s look at some different styles of preparation. There is more than one correct way!
In coaching, we talk about the forehand throwing action, because the correct hitting action is just like an overhead throw. Practising throwing can help you learn overhead technique.