念而不舍锲而不舍
[niàn ér bù shè qiè ér bù shè]
This username conveys perseverance and persistence in one's beliefs or pursuits. It combines the concept of 'continuously thinking without letting go' (念而不舍), symbolizing unwavering thought, and 'constantly chiseling without giving up' (锲而不舍), representing relentless effort.