Despite the fact that I manage to express my thoughts in English decently, I often get stuck mid-sentence because of nervousness. In addition, I tend to over-explain everything, especially when I am confused about something.
According to the Internet articles, visa interviewers are not interested in grammatical correctness. Instead, your confidence, consistency, and accuracy are the main requirements. Any pauses may be interpreted as a lack of confidence and, accordingly, doubts regarding the veracity of your visa application.
In this regard, it is beneficial to speak aloud. I worked on improving my English skills using the permito ai platform, which records your speech and generates answers and additional questions after that. Thus, it becomes apparent how fluent you are at the conversational level, considering that all communication implies the use of voice. From approximately session number 6 or 7, I stopped myself from filling gaps with redundant words and replied only to the question asked without any changes in accent.
To conclude, being a native speaker of a language that you will be learning for your visa interview will not be a determining factor for approval. You must be sure about the goal and dates of your visit.