Thoughts of the Bears: Bitcoin has been on a rise, altcoins are draining liquidity, and the prices of altcoins are also high. As long as Bitcoin pulls back a little, altcoins will continue to plunge. Therefore, shorting at highs is advisable, and there's no rush to go all in; there will be lower entry points.
Thoughts of the Bulls: The bull market has arrived, and the market will only fluctuate upwards. Even if there is a drop, it will quickly recover. Once you get out, it will be hard to get back in. The market is meant to cause anxiety, and then, amidst that anxiety, the bottom will rise, leading to an ongoing increase. So the earlier you go all in, the better.
Are you a bear or a bull?