How do I keep my intention pure when I genuinely need the money and I’m working long hours for my family?
The long hours and the tiredness are real, and so is the need. Here is something that changes nothing about your schedule and everything about what it is worth: your work and your worship need not be two separate things.
The whole matter turns on one teaching of the Prophet, peace be upon him.
“Actions are but by intentions, and every person shall have only what he intended.”
The Prophet (peace be upon him), Sahih al-Bukhari and Sahih Muslim (Bukhari 1 / Muslim 1907a) · meaning
See what this opens. Needing the money does not spoil your intention. A sincere intention does not ask you to stop needing; it asks you to remember, quietly, for whom you are working. The provision is Allah’s arrangement, and your sitting at that desk to feed those He entrusted to you can itself be lifted toward Him.
“Say, indeed my prayer, my rites, my living and my dying are for Allah, Lord of the worlds.”
Qur’an, Al-An’am 6:162 · meaning
Your living, your whole working life, can be gathered into those words: for Allah. And if you fear that ordinary, worldly-seeming toil is too small to count, notice how the Prophet, peace be upon him, measured even the smallest act at home.
“You will never spend anything, seeking by it the Face of Allah, except that you are rewarded for it, even the morsel you raise to your wife’s mouth.”
The Prophet (peace be upon him), Sahih al-Bukhari (56) · meaning
If one morsel placed in love is rewarded, the hours you spend so that the morsel exists at all are not lost. One sincere intention, renewed at the start of the day, turns an ordinary workday into an act of worship. The masters of our Naqshbandi-Mujaddidi way teach exactly this: keep the heart with Allah while the hands are busy with the world, and the marketplace becomes a place of remembrance.
One small step: Before you begin work tomorrow, pause for one breath and say in your heart, “Ya Allah, I do this for You, to care for those You have given me,” and let that one intention carry the whole day.