indeed, if the price is going down, of course it is better if you have sufficient funds to buy it immediately, because an opportunity like this may not be possible again if it is too late to carry out the execution. but you also have to be smart to see where the funds will be invested because if you choose the wrong coin, you can be sure you will experience a loss, therefore in order not to lose money and don't want to analyze it again, it's better to buy coins at the best rankings that can be seen on the internet. CMC/CGK.

for bitcoin, it is certain that this coin is different from the others, because bitcoin has a very unique character. so if for bitcoin you will make a purchase at any time, it can be ascertained that in the future the price will exceed the time it was purchased. but if it is going down, it will be even better because it will certainly make a bigger profit. so act carefully if there is time to buy immediately, before the opportunity actually gives the opportunity to be smaller.

currently the price has increased from what the op said so if you want to wait like when the price at that time of course it might not be fulfilled in the future, because the price is indeed stable and still does not move in the $35K-$42K position. Of course you need a new study and whether you need to wait or buy immediately, if bitcoin is clearly no problem.