Maybe what you said is absolutely right, that is, persistence is the key.

I understand and it can be frustrating, but you have to persist and even though you may think you are not improving, I promise you, you are. It's just a matter of time before you will notice the steady improvement in both your speaking and you confidence.

Do remember some phrases and materials are more important? A lot of times, I have read texts loud in the morning like you suggest, but after reading it loud, I, a non-native English speaker, still do not know how to express my idea correctly and fluently.