My way of dealing with this anxiety before was to keep buying, but telling myself not to go long-term, only short-term. Because even if there’s a big internet-style crash and pullback, there’s plenty of time to stop the loss, and I can just buy again later in less crowded areas. If there’s no crash, it’s a great opportunity to keep making money in the first half of the year. Then when the big IPOs come around in June (not expecting a crash or drop), I’ll leave some positions to feel out the market, and then buy back in when the right opportunity comes.