Easier said than done I know, but try and relax and let your personality shine through as much as possible during the assessment process.

Keep trying to build on skills and say yes to opportunities

I know it sounds super cliche but if you can find something you enjoy doing you're almost certainly going to be insentivised to do it more often and do it well. Obviously there will be times in your career where you struggle and find things difficult but if you have a goal you're determined to work towards and you can find enjoyment in your work you will succeed.