Well, this really depends on you. There are already million-billion dollar companies already buying and holding Bitcoin. So if these million-billion dollar companies spent millions - billions to buy and hold Bitcoin, why me even a hundred-thousand worth of Bitcoin can't hold? That's kinda my belief to hold Bitcoin.
Whale, institutional investors have huge and bigger capital than retail investors with smaller capital. Retail investors are not market manipulators or market makers but they have big advantages against whale, institutional investors.
With smaller capital, retail investors have advantage of more easily entries and exits in the market. Their entries and exits won't affect trading volume and market price. It's different than whales and institutional investors, with big capital their entries and exits will cause dramatic ups and downs in the market, both in trading volume and market price.
About going all-in. For me, I don't do that, I also had some cash or some funds in the non-crypto market. But for cryptocurrency right now, I mostly hold Bitcoin.
It is good capital management as well as risk management. We need to have other things beyond cryptocurrency, to manage risk, avoid black swan events in this market and to be always ready for spending through non cryptocurrency payment methods.