Is the prayer of one who prays alone in a row behind the congregation valid due to the lack of space in the last row?

Your prayer is valid if you made an effort to find a place in the row but did not find one, because Allah Almighty says: (Allah does not burden a soul beyond its capacity). And the hadith in which the Prophet, peace and blessings be upon him, commanded the man who prayed alone behind the row to repeat his prayer, applies to one who intentionally prayed alone behind the row and was negligent in finding a place in the row or another worshipper to pray with.