Which is the best strategy for the future
1. Buy altcoins and hold for the next halving season
2. Build mining rigs and start mining some coins like ravencoin and ergo to hold some for the future
Mind you I don't pay for electricity bill cos I have solar installed
If I were you I would currently mine as many coins as I can, and convert all this to BTC. Then if we indeed did top at $64K and the next year or 2 will be a bear market then hold all your BTC and buy a bunch of alts when they are >95% from ATH in a year or so.
Some will basically go down another 95% and will be worthless but you will be able to get a handful of alts which can produce amazing gains into the next halving. Sure they might not all recover the 95% lost value but even if you buy it at the low and it ends up going another 50-100% from there, you will made good profits. Then sell those alts back into BTC and either hodl that bitcoin or just tether up or withdraw into your bank account.
Basically super low risk for you.... and sky is the limit in the amount of profit you can make. Well unless all your GPUs get damaged somehow, but that is rare.