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I want to highlight one of the things Moose408 is talking about: speed. I like his suggestion of 3 times and if you make a mistake slow down. The part I do differently is when I speed up. I will only speed up when I have tension both mental and physical whipped. This is my path to the fastest progress. When I am attempting something new I slow down to seemingly ridiculous speeds to mitigate and jettison tension. 30 bpm if necessary. One beat ever two seconds. That is a lot of time. It may not sound musical but it gives my body and mind a chance to sync up. Once I have achieved tension free playing I can crank up the speed being mindful to never chase the speed using tension as my guide to when I have increased bpm too quickly. I spent many years chasing speed. My time was not used to my best advantage.
It takes time to develop skill to execute rhythm so that it makes sense in your head and is consistent. Your time is different than my time. Let go of any time frame (as in, I will get this by next month, year, decade etc.) if you find yourself dealing with frustration. Work on removing tension. Use bpm as your tool. You will get it. Frustration is the nemesis of fast progress. Yes, I had my share of that too until I started working on tension.