Synonyms of fit in
adaptIf you adapt to a new situation or adapt yourself to it, you change your ideas or behaviour in order to deal with it successfully.
• Things will be different and we will have to adapt.
conformIf you conform, you behave in the way that you are expected or supposed to behave.
• Children who can't or won't conform are often bullied.
Thesaurus for fit in from the Collins English Thesaurus