For me, your choice of coins remains unclear, since you yourself understand that in case of a Ripple loss, the price of an XRP coin may approach zero and nevertheless you are considering it for investment. 3-4 years for investment is a long time, therefore, it is necessary to choose coins from those that after this time will not only remain on the market, but also increase their value.
It is important to make a wise decision considering many things,
because at least that way we can analyze the risk which is good for ourselves,
there are still many decent and safer coins for investment and if indeed for the long term of course the best choice is Bitcoin.
I do believe that we could make a portfolio out of such amount, we shouldn't pick just one. I mean 10k is a good amount to say that maybe 5k for bitcoin is enough, going for full on 10k with it may make it a bit rigid and that is not something we want in investment.
Most crypto move together and that is why we can't really say that it would be a decent thing to do, maybe it sounds like "what if I put it all on bitcoin, they all move together anyway?" type of deal, but at the end of the day we are talking about still a bit of difference and that is why it should be a lot better. I personally diversify it as much as I possibly can and it does bring out a great deal of profit for me when I do that for sure.