I have played the game for thousands of hours since 2004. I have Magic 106, Ranged 104, Constitution 100, Defense 99, Summoning 99, Slayer 104. I have 135 combat -- the highest possible is 138. Maybe playing video games is a weakness. Indeed, my Strength is only 90. That is incredibly low for my rank.
And I still have to slay about 700? abyssal demons in order to get Invention 108. Then I will mostly work on the Alchemizer.
The quest will be successful. It is not serious. My greatest success is that I did not undertake any tasks impossible for a person with Autism and Moderate Depression. I did not aim for a job above my abilities. I did not try to build a family. Thus I did not fall from unattainable goals.
I find nothing is impossible, with the right amount of weed. Gotta be sure to chose what you need tho. Sativa, or Indica... Perhaps a Hybrid... Helps with types of Autism as well I hear tell.
If you started in 2004 and spent the time you were playing runescape earning an extra $100 per week instead, you could have invested it and made over $130,000 by now.
If I was neither Autistic nor Depressed, I could have worked like an electric locomotive. Maybe $130,000 is not worth the energy needed to earn them.
You could damn near make $100/wk holding a cardboard sign that says "Funding my IRA, please help!" on the off ramp on Saturday afternoons. Your autism and depression would be an asset to that venture!