Practicing tongue twisters and reading aloud are excellent ways to work on your pronunciation and enunciation. Pay special attention to words with terminal consonants, like the 't' sound in "thought" and "unite". It's important to ensure these end sounds are fully pronounced. Recording and listening back to your performances can also be incredibly useful, as it allows you to notice areas you may not be aware of during live speaking. In terms of varying your energy levels, think about the emotion that each sentence is trying to convey. Is it a happy, excited, sad, or reflective moment? Adjust your tone, volume, and pace accordingly. You might find it helpful to annotate your script with notes on how you want to portray each line. This way, you can plan ahead for shifts in energy and emotional tone. Breath control is another crucial aspect of effective voiceover work. It seems like you might be starting some sentences with too little breath, which can impact your ability to deliver the line effectively. Try taking a fuller breath before you start each sentence. Deep, diaphragmatic breathing can give you the breath support you need to deliver your lines more confidently and effectively. Breathing exercises can help strengthen your diaphragm and increase your breath control. A simple one to start with is to breathe in for a count of four, hold your breath for a count of four, then exhale for a count of four. Repeat this several times daily to improve your breath support. Remember, voiceover work is as much about physicality as it is about your voice. Even though the audience can't see you, embodying the emotion and energy of your character can enhance your performance. Keep exploring and refining your skills, you're making good progress!