Does a young Muslim man's praying alone at home instead of in the mosque for ten years out of negligence invalidate his prayers and prevent him from entering Paradise, knowing that the number of worshippers in the mosques of his area is limited?

Prayer at home is valid, and its validity is not conditional upon being performed in the mosque. However, abandoning prayer in the mosque results in the loss of a great reward and many virtues. A Muslim should strive to maintain congregational prayer in the mosque, abandon laziness, and seek refuge in Allah from it; for it was part of the Prophet's supplication, may Allah bless him and grant him peace: "O Allah, I seek refuge in You from laziness."