يا ترى الخطا فين:Remember to get there early otherwise you may not get a seat

[ابو بيشو]

اليك منى كل احترام وتقدير
Remember to get there early. Otherwise you may not get a
seat.
Remember to get there early or you may not get a seat.
Unlike or, otherwise is an adverb (NOT a conjunction): 'I'm glad
that you told me about the show being cancelled. Otherwise I'd have
travelled all the way to Glasgow for nothing.