You've got a good sense of pacing and clarity in your delivery. However, as you pointed out, patterns can make the delivery sound a bit predictable. To add more dynamism and keep your audience engaged, think about varying your inflections, volume, pacing, pitch, and overall vocal variety. This diversity can make your voice more engaging and dynamic. Imagining that you're in a large space without a microphone can help you naturally increase your vocal projection, which is crucial for capturing and maintaining your audience's attention. Keep experimenting and fine-tuning these aspects, and your delivery will continue to improve.