What is the opposite of the idiom "First and foremost"?

• First and foremost
English Meaning: most importantly; more than anything else.
Bangla Meaning: সর্বাধিক গুরুত্বপূর্ণ; প্রথমে এবং সর্বাগ্রে।

Hence, the opposite of the idiom "First and foremost" is - Finally and least importantly.

Ex. Sentence: He considered himself first and foremost a writer.
Bangla Meaning: সে নিজেকে সর্বাগ্রে একজন লেখক হিসেবে দেখে।

Source: Website Lecture.