So, at one stage in your life, you should set some goals for something that you want to achieve in the future. The same is applicable to Bitcoin and you should set some realistic goals for yourself.
I know a lot of people are aiming for 21 coins

Would you stop after you reached your goal or would you set new goals after that? When will you stop collecting and hoarding your coins or are we all a bunch of Scrooge McDucks?
Let's see how many people have decided on specific,
realistic goals and how many people are just collecting coins without goals.
My precious..

That's a funny question. Even though this question doesn't add much value to the community but still a fun thing to indulge into. My home mortgage value is around 10 bitcoins at the current market price. So my primary goal is to gather atleast 10 bitcoins so that I can payoff my mortgage commitment. That's a big loan in my local currency and I am paying a hefty EMI every month for that. But I know it is hard to reach within few years of time unless I win some lottery or jackpot. So I look forward to save at least 10 bitcoin in next 5 years.
However, there is no question of stopping even after I reach my goal because who doesn't want financial freedom?? Definitely I want to continue my earnings in bitcoin so that I can save for my kid's and my parent's future expenses. I mean who doesn't want money? The more the merrier!