Just this morning I decided to quit my activity here at YA after answering during three years more than 500 questions. Now I stumbled over your question that exactly has to do with why I don't want to continue here: It seems, that nobody wants help if this includes self responsibility and for example a change in ones life style. Help is only accepted when it is in the range of ones established mindset and confirms oneself.
I had ask myself the same question you are asking now and came after more than thirty years of trying to offer a *key*, so that people are able to help themselves, - to the result, that people are so much programed in their mindset and so much identified with it, that they are not capable to do a step beyond. Not even when they are extremely suffering. They still expect and are open for help from the outside and the social and medical health system, precisely that, what has brought them into their desperate condition in the first place. "You can't solve a problem with the same mindset that has caused it!" (Einstein) Yes, that's true, if you have a solution for the problems and with this one needs to go beyond the established mindset, then nobody is interested. Maybe a very few who are so tired after going through a life long struggling, realizing that we live in a false reality created by ourselves, that finally they question every thing and then take the reigns in their own hands. (In my estimation about one person out of 100.000).
One of the answers said: "Market your *key* and sell it." Yes, this is how it works with any thing that is produced and then sold in our society and as more expensive you sell, as more it will be appreciated. But it doesn't work with the *key* you might want to offer, because it will need a different approach that it can work: One needs to get out of the attitude as a victim, taking initiative and self responsibility, - with other words: Getting out of dependency! At least that is the case with the *key* I have found.
So what can we do? This question is still open and there are little possibilities that an answer will show up here at YA.
I will think about it and come back later...
I don't know what kind of *key* you might have, - but I have the impression that this is a fantasy and not a real question. To save the world from disease would mean to interfere into evolution and the process of growing, as there is a good reason for all results. Better and more real would be to be able to offer a key that makes disease and deprivation understandable as part of our learning and so could make it to a creative process, were people are involved with their own responsibility and motivation...
If you want to know what I have found out and what I can offer, then you must ask me or look for it by visiting my Web site or my other answers here at YA.
PS: When I use the word *key* then I don't mean a new high pitched sophisticated spiritual concept. I am giving information and advice about practical things one can use in daily life and that will further ones growing and healing process. - And to make it clear: There can't be money involved, because this belongs to the field we have left behind...
Edit: I have send a message to the asker USA and had ask him to explain in 'additional details' what he sees as a 'key'. Shouldn't we use this space here at YA to find all together the answer to this question? And then this maybe is part of the answer, coming out of our motivation, initiative and action. Here at YA an exchange is difficult because there is no option available like chat or a discussion connected with the space of the question. But at least we can try by editing our answer and the asker can add more additional details. This is an occasion to show YA that there is a need to develop this space... And also to show that we are interested and active without getting 'points' for it!