Up and down is a normal market mechanism, so don't worry too much
Think like a hunter, not a gambler
You could buy at 45k, it could drop to 40k, if you do not sell and just be upset that it dropped then you still have a chance to recover when it goes back up to over 45k, but if you sell and see that it goes back up to 45k+ then you are going to be even more sad. This is why people should be calm about what they are doing, it is definitely not something that is smart to move on every single move because bitcoin is a very very volatile thing that will always have 5%+ moves daily in many days a year.