I think you are misapplying the 4% rule -- that figure reflects how much you can withdraw from your portfolio, not its growth rate. For the growth rate, you can use the rule of 72: basically, take the rate at which you expect the market to grow, and divide that into 72, and the result is how many years it will take for your current 'stache to double. So if you take the $350K that you have in cash and investments, and you expect the market to earn an average of 7% over the next decade, you will have about $700K in 10 years. And once you have $700K, the 4% rule says that you can take out $28K/yr, plus inflation increases, likely forever. So even if you never save another cent and your business investment crashes, you will be FI in less than ten years.
I agree with civil4life: you need to identify your goals. You seem to have a very solid foundation and low expenses for your part of the country, which should set you up very very well for the future, in whatever form that takes. The primary change I would make is getting your extensive cash into investments sooner rather than later - if half your 'stache is in cash, your average return over the next decade is likely to be more like 3-4% than 7%, which means it will take more like 20 years to reach FI. Also, if it were me, I'd sell the crypto, but it is such a small portion of your portfolio that it won't really hurt you if/when it goes to $0, so if you enjoy playing with it, go ahead.