At which stage of the process? If it's about getting initial interest at all, you want to do things that builds your brand or you can put on your resume. Write

At which stage of the process? If it's about getting initial interest at all, you want to do things that builds your brand or you can put on your resume. Write a blog, maintain a personal website, do side projects, etc. If it's about getting past one of the screening stages, you'll want to focus more on soft skills. Voice coaches and voice therapists are a thing, and speaking in a likable way is extraordinarily under-emphasized. Similar things with body posture, confidence, and communication style in on-site interviews. If you're getting a lot of "we like you, but not sure you're a good enough coder" then it's time to binge-solve problems in "Cracking the Coding Interview". The problems will help some with the last paragraph of issues to some extent as well.