Is the lack of success in studies and sustenance a punishment from Allah due to negligence in prayer and an abundance of sins? And what is the solution?

The obstruction of your worldly affairs may be due to sins and transgressions from which you have not repented, for Allah Almighty says: "And whatever strikes you of disaster - it is because of what your hands have earned, and He pardons much," and because the Prophet, peace and blessings be upon him, said: "Indeed, a servant is deprived of provision by a sin that he commits." Sins obliterate the blessings of life, provision, knowledge, deeds, and obedience, and the blessings of both religion and the world. Negligence in prayer is among the greatest sins, and the solution is to repent to Allah Almighty from these transgressions.