Is this grammatically correct? “If you don’t watch till the end, you’ll miss the treasure. Or until the end

The sentence "If you don’t watch till the end, you’ll miss the treasure." is grammatically correct. However, the phrase "Or until the end" is a bit unclear in its context. If you intend to offer an alternative phrasing, you might say, "Or if you don't watch until the end." So, a more polished version could be: "If you don’t watch till the end, you’ll miss the treasure, or you might say, ‘until the end.’" This way, it clearly connects the two thoughts.