I had a go, and a think about the niche I wanted to create for myself. Here goes...
a) Becoming a more confident communicator in English.
b) Becoming a more confident communicator in Business and professional environment.
c) Improving my communication skills without having to memorise endless vocabulary lists and grammar rules.
d) Master what you already know, and become more confident and comfortable with it, so you can speak up in meetings, wow the audience with your presentation skills, and negotiate like a pro.
I realise it may be a little wordy, and trying to tick too many boxes, without niching down enough - almost like an add-on to the previous niche. Any support would be welcome!