I know for me personally (this is a more recent happening/story)
When ironman was being put into the game I told myself that I was going to be rank one ironman for agility. I also did it as a hardcore ironman just so it would look cooler I guess? (doesn't matter)
So I was putting in 14+ hours a day into agility on my days off and on the days i'd work (Usually 4pm est to midnight) I would come home from work, do agility till 5am sleep untill 8, wake up and grind agility till I left for work, and I did this until I got to about 73~ and all my modivation just went to shit
I quit the goal and started a new project of mine.
I'v been playing runescape since 2007 and in the 8 years i'v been playing, I'v gotten 99 Prayer/firemaking/herblore all from purchased GP and the only 99 that I had gotten by hand was 99 strength on my 16 attack obby tank.
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I'm working on my dream account now, and my ultimate dream is to have 99 agility, runecrafting, and mining and right now my modivation to gain xp and get those levels is through the roof, but I know sometime soon, i'm going to hit that "Block" persay and I need to understand how to get past that