Economics and capitalism dictate that BTC will be mined almost entirely with renewable energy in the future. HODL and stack stats during dips and you will be fine.
But have you considered that more versatile forms of crypto with better utilization & scalability could possibly dethrone BitCoin?
Remember, I hold BTC + 6 other altcoins in my portfolio, so my interest is for it to succeed, but I am able to appreciate that better forms of crypto are being developed that could be more useful than BTC.
I know that for years, BTC has been the father of all cryptos, but why marry it? I know you're heavily vested in it and have upwards of 45+ BTC coins (which at the most recent ATH of $64K, would have already made you a millionaire, albeit to the tune of $2.3 Million after taxes, assuming you live in the USA). Since you're generously vested in BTC, what is your exit strategy assuming it doesn't live to its potential?
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