Bitcoin mining is more like a long term investment,
I disagree, mining is a very short term investment, many Chinese miners call it "a hit and run" which is a perfect description of how mining businesses actually work, you have a very limited duration and racing against the mining gears you invested in to become 1-obsolete and cost more to run than profit 2-They break and stop mining for hardware related issues.
OP, I'll side NFW here, mining is not suited for this kind of operation, to be honest, the whole crypto industry isn't for that matter, if I have people sending me money to feed orphans I would surely not put any of that money anywhere near a volatile market, instead, maybe invest some of that money to teach those kids some skills which they can use later on in life to earn some money.