• Progress isn't linear. There would be times you rank up faster and there would be times you will stagnate.
How to resolve : Notice if you can get higher acc on a particular maps you like to spend time with, that's already an improvement. You will FC it sooner or later, and you will see gains.
• Narrow experienced skillsets. If for example, you only play aim/jump, you can only ever good at aim/jump plays. It's easy to get lost when you just on a bad day, and can't get anywhere because you can't play other things.
How to resolve : Obviously play more on other things. Best way is to gather maps from auto-rotate multi lobbies!
• More time is needed. Simply sink in more time in osu, let your mind adapt and your hand coordinated faster and more precisely