Pass it on to your children and make sure they understand the importance of passing it on to their own offspring - and try to be as convincing as you might. If future generations consider your message to be important enough, they will keep passing it on, and it will eventually enter "common sense/universal knowledge". If not, the message will eventually get lost (and probably for good reason). Your question implies that (you believe) any one of us (today) would have knowledge or advice to provide that will still be of relevance in 50,000 years from now. That may be so, but then they had already made it known to us. It were rather pointless to keep from us a message that "must" survive 50,000 years, but preserve it for future generations who might never be born.Any technical approach is rather useless, because it relies on the idea that what technology we know and use today will remain accessible for thousands of years. It doesn't matter which technical solution you opt for today, what really matters are the technical options future people will have to solve the riddles of their day.Physical devices, be they fancy gadgets or carved stones or books, may help your message survive physically (at least for a considerable while), but that doesn't mean your message's meaning will survival too. If anything, the religious scriptures we know today prove this flaw dramatically. What valuable message ever you may have for future generations, it won't make much sense without the proper historical context.
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