帮我看看这个句子有语法问题吗,The main reason for my confidence in this position lies in both I have the qualifications for this job,and I have the right personality for a reporter.

语法没错，不过态度是否有点强硬。要不尝试这样说？
The reason I have confidence in this position is mainly because of my qualifications for this job and my valid personality for a reporter.

有问题。
both my qualifications which suit this job and the appropriate personalities for being a reporter lead to my confidence of competing for this position.

语法倒没有太大的问题,但很别扭...建议如下：
I am confident for this reporter position because I believe I have the right qualifications and the fitting personality.
面试的说得信心一点...列举“原因”的表达方式不如直接说.

I would like to say:
I am confident that I will be a great fit for this position.
First of all, I have accumulated many professional skills which are required by this position
Besides that, I believe that I have all the personalities that a reporter should have.