Depends on how your outlook is and how long you are willing to invest that money.

If you are looking for short term gains, altcoins will be the place to enter. Be mindful that altcoins are mostly pumped and dumped by their bagholders and getting an organic price to buy/sell at is a rough situation.

If you are looking for long term gains, bitcoin is the one thing you need for the long. It has been time-tested against bear markets and every time it bounces back from a bear it goes beyond limits.

Beyond that, you should also think about investments in sectors other than crypto. They are also time-tested and stress-tested.