As long as it's resolved down to this, I think the best most obvious advice would be to always work on your weaknesses. It's fine to work through technical studies, but you always need to focus on what you are struggling with in isolation. Any particular interval or note that just isn't nails? Work it and work it and work it. Make your own practice routine focused around what it is you need to improve. All the practice of the usual technical studies won't help if they aren't centered on what you need the most work on.