A person can improve in his profession and there is nothing wrong. Probably not everyone will be able to work their entire life at the same job, but there are those for whom this is normal. This may depend on the country in which the person lives and on the person himself. Maybe he is improving himself at his workplace, or maybe work is not the main source of income for him and he views his work as entertainment and an activity for the soul. Maybe there is simply no opportunity to change your life and get an education. For example, a person simply does not have the necessary qualities.
If someone chooses to try another profession, of course this is very natural because they want to try something new because their previous job was very boring or the income they got from their previous job is no longer sufficient to meet the needs they need, of course they have to look for work. others who have greater sources of income to be able to meet their needs.
If someone does not have the qualities according to the skills they have, of course they must be able to find work according to their skills and it is impossible for them to work in a field that they cannot master.