Kudos to you for caring and wanting to contribute!
Regarding your vision to contribute from the fields of art and humanities, I can tell you my personal thought on the matter—which only represents me, but maybe you will identify with it: with the progress of human knowledge and technology, the possibility of human society (and of every detail in it) to change the world is growing at an exponential rate.
This means that the most effective thing that can be done today for the sake of the future, is to pass on to future generations the desire to improve the world. Every effort we make to improve the world will translate into greater impact if we invest it in preserving the ideology. For example, if each generation invests 95% of its effort in spreading the ideology (of EA and related ideologies) to future generations, and 5% in searching for solutions with the tools we have today (the 5% can be seen as a kind of “dividends” from the investment of preserving the ideology), I believe That the future will be much better than if we put most of our efforts into finding solutions right now.
Fortunately for you, the humanities and arts can contribute greatly to efforts to preserve and propagate ideologies.
But this is not a simple task at all! For it to be effective, the messages themselves need to be relevant for the long term—more conceptual and less specific (for example, probably environmental advice that is important will not be relevant in 100, 200 or 5,000 years; but the understanding that all animals deserve rights will be relevant in the future as well).
In addition, the task of transferring ideas to the distant future is very difficult in itself. But it is possible: it has happened with a number of philosophical ideas, social and political ideas and religions.
I believe this could be a direction for what you are looking for.
Good luck!
First of all, I’m really sorry to hear about your condition.
Regarding your association: it sounds interesting, but I didn’t fully understand—is it mental and social support for people who are dealing with serious illnesses, or does the organization claim to treat illnesses instead of medical treatments? What exactly does the organization do?