To be honest I like Bitcoin for long term investment because it offers a very quick return on investment. I also like Bitcoin for risk free investment because it allows you to save money for life. In the past people who bought Bitcoin and held it for a long time made huge profits. Many big institutions and investors are dreaming about Bitcoin and are announcing its price in millions of dollars. Again, different countries are holding Bitcoin as a reserve. So in terms of best currency and low risk Bitcoin is the best and you can be safe in the long run.
Bitcoin is the one true answer, while there are other coins that you could be interested in, that doesn't mean that you should leave bitcoin to the side. If you have some crypto, but no bitcoins at all, then you are making a big mistake. As long as you have most of your money in bitcoin, then you are going to do fine, and I personally believe that while it is going to be tough, it is not going to be impossible and we could make some money out of this as well.
This is why the best way to move forward would be buying up bitcoin. Since this is altcoin speculation, I will say that after you get bitcoin, look for trusted top 10 coins as well, both bitcoin and those other top ten should cover %90+ of your portfolio, then you can do silly small tokens for fun with the rest.