自画自賛 (じがじさん) Japanese meaning | KotomoraMeanings
1
noun, noun or participle which takes 'suru', transitive verb
self-praise; singing one's own praises; blowing one's own horn
yojijukugo (four-character idiom)
Refers to praising oneself or one's own work, often with a negative connotation of being boastful. Commonly used as a noun or with する.
I don't mean to blow my own horn, but I think this project turned out well.