It really just depends on the moves. Can you give us an example so we can guide you towards the right path?
And just in general, an opening repertoire usually requires an opening as white and two as black: One against 1. e4 and 1. d4. Not that it matters at your rating that much; as long as you're applying the general opening principles, you should be just fine until around the 1000 level or even higher
I just started playing Chess a month or so ago but have about 2,500 games in blitz (10 min) now.
I found 1 good strategy that includes the first 6-7 moves. I can win about 50%+ of the time with it. If I try anything new or deviate from these opening moves I have a really low to no chance of winning.
Is this normal? Do I just keep playing the same game over and over to gain points? Keep playing the same moves with 1 deviation to perfect my game?