I don't see anything wrong with going all in on bitcoin. I think we have seen the worse days of market in December 2018 and believe the worse days are behind us and we are about to witness the full recovery of the market.
Going all in is what noobs do. Every serious investor makes sure there is always enough investment capital on the side to buy in will the price drop further, which is a possibility that always exists. Bitcoin's decline from $20,000 to where we are right now is the perfect example of why that is important.
This market is messing with people's mindsets continuously. Today they have all the confidence in the world to go all in, while if it drops like 5% the day after they suddenly pull back out of fear. People tend to overestimate their ability to either trade or invest, which ultimately leads to severe losses if you're stuck in a cycle of buy high sell low due to how hostile this market can be.
The more comfortable you get with current prices, the more difficult it will be for you to deal with the situation will the price restest its prior lows.