I've been working on my presentation skills, and I think I've made some progress, but I still feel nervous when I speak in front of a group.
Nervousness is normal! Try is to practice grounding yourself before speaking.
Here’s a helpful guided box breathing video. Also, check out the TED guide to public speaking.

ConsciousWorks
One minute box breathing exercise
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Chris Anderson
The Official TED Guide to Public Speaking
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Thanks! My colleagues said I’m doing better at simplifying complex ideas, which was a big focus for me.
Simplifying your ideas is a big win!