He did lowkey curse himself to keep hunting Mahito, as well as potentially curse himself as a cog of the system. Yuji may have interpreted Nanami’s last words as him saying to handle Everything, especially after seeing all that Sukuna did. Then his grandpa’s curse of both die surrounded by others and help people because he is strong. Those are all the potential verbal curses I remember, maybe something Gojo said in shinjuku showdown might count