About including my skills in my profile

Accepted answer

Even if the categories you mentioned are not in auto-suggestion, but you can simply type them and on save they will be visible in your bio.

so just add them , for example xyz is not a category but you can type them mannualy and it will be saved and will reflect in your bio.

Try as @Jignesh said, you also add in BIO

Try in different browser. Once faced same issue. Try to edit profile again and click on save button.