I disagree, as an investor the most important part of investing in bitcoin should be patience, timing comes second. Timing only plays a major role or works when you're a trader or speculative investor, investing for just a short period of time. For example, we have bitcoin enthusiasts who did invest when bitcoin was around $400-$1000 (you can call that perfect timing) but today due to lack of patience most of those investors don't have a single bitcoin due to impatience some might have sold at lost or little profit. As it's commonly said, "investors don't wait to buy (timing), they buy and wait (patience)".
I agree. My brother was one of those lucky investors who invested in bitcoin when it was $1100 and he'd been very patient and at the same time well aware of the market, which helped him to predict the market trend but having said that the crypto market is highly unpredictable and it's a high risk. Gotta be brave and smart in taking risks where the idea of loosing wouldn't freak you out but rather will teach something new.