try, effort, attempt, strive, endeavour, enterprise, endeavorment, endeavourment, conatus, essaying, more...

idleness, laziness, inactivity, passivity, indolence

task, job, chore, mission, errand, undertaking, more...

human, scientific, intellectual, creative, cooperative, artistic, earnest, educational, constant, vain, common

try my best,   strive to,   a lot of effort,   make effort,   struggle to,   putting in effort,   more effort,   to strive,   conscious effort,   strives to