How to improve English communication

hey folks kindly suggest!! 🙌

I'm seeking recommendations for courses that can help enhance my English verbal and communication skills, as I've missed out on numerous opportunities due to my communication limitations. Unfortunately, I faced rejections in several interview rounds at prominent tech companies like Meesho, BrowserStack, nference, and Zscaler due to this issue (I constantly feel like I'm failing to express myself effectively, which has significantly lowered my self-confidence). Any guidance would be greatly appreciated. Please 🥺

I have good grip on grammar but when I try to speak I lose control and I am always lack of words while speaking but this is not the case while writing. How to improve this thing? One thing worths mentioning here that I become nervous pretty quickly. It may be the potential cause behind this issue.

I have been trying to learn Spanish for a while now. My only source has been the Duolingo app. But I feel like its not enough. What methods or resources have you found most effective for learning a new language later in life, especially while balancing work and other responsibilities?

I came from a government school where they taught in my mother tongue. After completing 11th and 12th grades, I cracked the JEE exam and went to NITs. However, I never worked on improving my English. Just two days ago, I had an interview. They asked normal questions, and after 15 minutes, the interviewer said, "I am done with you. I asked everything I wanted to." I answered every question and thought I was getting the job. Later, one of my friends who works there told me that my communication skills were the problem, so they decided not to hire me. I just wanted to ask if there is anyone who can give me advice or suggest where I can improve my English