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Do both verbs can be used interchangeably? I want to use it to mean “get a long with others.”

You should fit/blend into the crowd.

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nicetomeetyouDo both verbs can be used interchangeably? I want to use it to mean “get a long with others.”

Can these two verbs be used interchangeably? I want it to mean "get along with others".

nicetomeetyouYou should fit/blend into the crowd.

There are differences of idiom and meaning. You don't "blend into the crowd" in that sense. You simply "blend in": "You should try to blend in." You might blend into the crowd if you are a spy and do not want to be noticed at a fair, in a specific crowd. You do not "fit into the crowd" at all. You simply "fit in": "You should try to fit in."

To blend in is to look and behave as others do to become one of them. To fit in is more like finding your role in the society.