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
How many kilowatts per hour do you have for free?
You can buy a mining farm on used Px 470 4GB video cards. The payback period for these mining farms is 6-8 months. After Ethereum changes the algorithm, you can buy more modern graphics cards for good from miners who want to go out of business. Your costs are practically zero.