I really recommend you to buy some stocks, in the best case just build a globally diversified ETF portfolio. On the long run, this will give you an annualized return of 8-10 percent and with etfs you can achieve a very high diversification among stocks.

You should simply diversify your assets now. 100 percent in crypto is simply to risky.

And consider, if some of the asset classes move into different directions, you can rebalance your portfolio.

Good luck and congrats for that solid investment 4 years ago!