I don't follow any pattern, although I know a few people who try to guess it (I'm not sure about their success in doing it, although I doubt it).

What I do is simply allocate a preset amount of money (not too high), calculate the number of spins I can make with it, and stick to that number of spins. If I end with more money than I started, better for me. If not, nothing happened, as I made my mind to lose that initial money anyway, and I spend the remaining in some other entertainment.