Feeling competent and confident in your second language (corporate job)

Hi,

I work in a mid-sized organization in a role that requires evaluating situations, explaining decisions, negotiating outcomes, and delivering strong service. Communication plays a critical role in my day-to-day responsibilities.

This is the first time I have worked in my second language (English), and despite having some experience in a similar role, I am still learning every day on the technical side. I've been at this company for 1 year and a half, and consider my second language as "upper intermediate".

However, I struggle a lot to speak to my clients, as I feel like I don't sound professional at all (I have a strong accent as well and my pronounciation is far from perfect). Even though I've noticed an improvement, I am far from the level I'd like to be. I feel every discussion is difficult and requires me to gather my courage to pick up the phone, whereas I would probably nail it if it was in my mother tongue. It definitely impacts the way I am being seen by my clients/colleagues, and also feel like it impacts the trust they have in my skills. This is a mix of confidence, mastering the language and also a lack of knowledge (in the job tasks).

I am about to throw in the towel and apply to a similar job elsewhere in which I would primarily deal with files in my mother tongue. I really thought when I started at the company that I'd get good with communicating by working solely in my second language... it looks like this is not enough

How could I accelerate my progress? Will I reach someday a level where it'll be effortless to explain difficult concepts, debate and negotiate? I would love to hear similar experiences from the Redditor. I feel like I am never going to be entirely satisfied with my English speaking skills...

Thanks!