Totally agree that all-out investment is not a smart decision. For investment purpose, voalidity and risk should be always put into consideration. In cryptocurrency world, there're mainly business forms like this: opeing exchange, mining machine, wallet in payment field and other deriviate product. I personally suggest invest in payment field with either less volatile and lower cost to run. Bitcoin ATM would be the best choice to most of ordinary investors to get involed in cryptocurrency business. Here is one for your reference.
www.dobiatm.com/twowayatm-violet.html
Email me if you need help with Bitcoin ATM. viva@outlook.com