Success is generally a good idea, but even the best can have downswings for period, so in the short term success isnt an end all tell. Base it on your thought process throughout each hand. Do you have a reason for making each move you make? Are you putting opponents on ranges, thinking about what your range looks like, what your opponents is trying to represent, etc? If your making the correct thought process on hands, playing optimally, and adjusting to your opponent success will eventually come.