What is the way to get rid of a lack of seriousness in matters, of backing down, and of negligence, and to strengthen resolve and patience, and to overcome fear and hesitation?

Among the things that can help you treat what you mentioned is frequently contemplating the stories of the highly determined predecessors, and whatever is available from the scriptural texts regarding the virtue of production and earning, along with seeking Allah's help and refuge from laziness. For the Prophet, peace and blessings be upon him, said: "The strong believer is better and more beloved to Allah than the weak believer, and there is good in both. Be keen on what benefits you, seek Allah's help, and do not be helpless." And among his supplications, peace and blessings be upon him, was: "O Allah, I seek refuge in You from helplessness and laziness." You may also consult the psychological counseling section.