should it be invested in bitcoin and hold?
or
should it be invested in alt coins?
and why or what will make it sustainable via etc vs. alt investment
You can place your 100k in your wallet so that your money will be safe and secure. In your wallet is it safe because you secure it and there are so many process to get the money and there also have a confirmation to your account. But if you keep it in your pocket you don't sure if it is secure because if you forgot that in your pocket there's a possibility that money will gone because it can be get wet.