i change my workout routine when i hit my plateau and i still have not lost no

weight why is that>? maybe i need to drink more water?.ive lost 41.5lbs 383.3 to 341.8. i was lifting 50lbs i went to 60lbs my heart is beating again so its working and im sweating alot more but not losing no weight
maybe i just need to hang in there and my body will say what the heck let him start losing weight again