downgrade
🇺🇸
/ˌdaʊnˈɡreɪd/
🇬🇧
/ˌdaʊnˈɡreɪd/
to move someone or something to a lower rank or level
The company decided to downgrade his position from manager to assistant.
to make something or someone seem less important or valuable
Critics often downgrade the importance of his early work.