For increased diligence, study Shaar HaYichud VeHaEmunah and reflect on being in the presence of Hashem, wherein your behavior should be as if before a king, especially while living in Eretz Yisrael. As for decisiveness, realize that the mitzvos are agents of Hashem, and strengthen your commitment to Torah and mitzvos.
https://www.torahrecordings.com/rebbe/igroskodesh/012/006/4153