You need a complete change, both professionally and personally.

你需要在工作上和自身两方面有彻底的改变。

《牛津词典》

They are allowed to change, only it must be a complete change.

他们是可以改变，只是必须变得彻底。

youdao

It's a complete change.

这是彻底的改变，彻底的。

youdao

American soldiers, used to being on the offensive, have had to adopt a complete change in mentality.

CNN: Iraqi forces now calling the shots

You notice how whenever there is a change of minister, we get a complete change in the education system?

BBC: School tests: Do changes go far enough?

The advent of the September attacks brought a complete change in the approach of the NSA toward doing its job.

FORBES: The Sheep Stop Here: Another Church Committee or Full Review of Privacy Laws Needed?