From the things I understand about there reasons of not being able to buy Bitcoin is actually the price so there is no strategy that will give them a lower rate of buying price of Bitcoin
It's their main barrier, as they consider Bitcoin price is too expensive, and even they think it will rise more, they hesitate to buy an expensive Bitcoin. If they can overcome this mental barrier and fear, they can start their investment but unfortunately, they mostly ignore "expensive" Bitcoin and spend money to buy "cheap" altcoins.
It's very unfortunately because altcoins are either low quality or scam and they will lose money with altcoins while if they believe in Bitcoin and invest in Bitcoin, they would have gotten very good profit.