Technical experts are often promoted because they have recognized knowledge and skills in their field. Whether it's IT, finance, sales, or marketing, they know their job very well. After all, that's what got them noticed!
The problem is that organizations often promote people based on these technical skills, not on their management skills. And many organizations offer very little support to new managers. This is why it's up to you to teach yourself the skills you need!
You first need to recognize that your technical knowledge may not help much in your new management role. Why? Because instead of just focusing on your own skills and successes, you now have to focus on the skills and successes of your team. Your mindset has to change.
This is where many technical managers make their biggest mistakes. Instead of paying attention to the "people aspect" of their new role, they continue to do what they've always done: work on their own projects and technical skills. But if you ignore your team and their needs, you're going to alienate them quickly.
Another challenge is that your identity in the organization changes. You may have been a superstar in your previous role, but now you're starting at the beginning again. It can be difficult for new managers to cope with this "identity demotion."https://www.mindtools.com/pages/article/newTMM_12.htm