I think the safest place for bitcoins is when you sell them at a high price relative to the current market situation. I do not really understand those who hold for a long time in the hope of some incredible growth. Bitcoin has long established itself as a coin that has its own character and is pretty nasty. If you want to be calm, then speculate without risk and after reaching the level of 100% profit, sell it both on the fall and on the rise. I have been doing this for several years and have never regretted it!