Holding really matters in investing in Bitcoin but it doesn't mean we have to do this our whole life. If we take a look at the price chart, prices are growing but can we think this will be the same trend in the next few years? Not for sure and it was uncertain. So I could say that holding will not be forever as it also depends on the market situation. Selling our Bitcoin during the bull season is a perfect option IMHO and get on the train back again once the market correction starts. But yes, this needs strong hands because waiting for 4 years is not as easy as people think as we need to deal our emotions as well.