I think this is a good question. My first conclusion I drew as an undergrad was that since I cannot currently grasp the purpose, I need to put myself in a position where that would be more likely. My grades went from just barely passing to near 4.0. I knew I needed to do well in school so that I could learn more, so that I can be more valuable to others, so that I may obtain more wealth and influence, so that I can have the ability to do more things...and perhaps one of those things would be discovering the purpose.

Since no one before has ever extracted the purpose from the fabric of the universe, I knew I needed to be able to do things that none, or very few, have been able to do. I decided I cannot lead an average life. Even if the average life of an American in the 2000s offers much more than an average life even 100 years ago, my rough estimations suggest that this still isn't enough to find the purpose.

I also went about abolishing my depression. Depression served no purpose other than to limit me by sapping energy, making me disinterested in things, and disinterested in people. I forced myself to find meaning in things based on what they meant to my new ultimate goal, that is, discovering the ultimate goal. With a goal in mind that I actually believed in, I could feel happiness and accomplishment every time I took a step towards it. The depression ended.

I studied what it is that makes people successful. It appears to me that being valuable to other people is central. Luckily I'm already fairly smart, because large scale success (as opposed to just being successful in your social group) implies a higher bar of ability since your social group is now "the world". Being smart is good, but isn't quite valuable to other people in a large way. So, I'm developing tools to help people improve their lives and simultaneously aim to elevate myself by elevating other people.

The final piece I feel I should share is that eventually, my ability to search for the purpose will run out. Specifically, I mean death. However, unlike previous generations, my generation has the luxury of believing (through medicine and technology) that there is a small probability that we can escape death far longer than those who've lived before us. I am torn about how to approach this. Should I drop everything and go study medicine and be a direct contributing factor to possibly escaping death, or should I gain wealth and influence and promote research through those means? I have decided on the latter for now. It is a bet, and its one I'm unsure of. In the end, though, if it becomes clear I'm on the verge of death... I can at least have piece of mind that I did as best I could and have no regrets for the way I spent my life.

Either there is a purpose or there isn't, and I will find it or I won't. If there is a purpose and I find it, win. If there isn't a purpose and I don't find it, then things like 'win' and 'lose' don't make sense because there is no way to be doing the right or wrong thing without some purpose to judge it against. If there isn't a purpose and I do find it -- thats not possible. If there is a purpose and I don't find it then, while perhaps its sad that I missed out on discovering it, I can rest assured that I've done everything in my ability to discover it, and hold no blame on myself for not living more optimally / doing the right thing.