I am relatively new with regard to bitcoin but what I have noticed is that a lot of people just invest on it and then cash in when they feel like it is already enough to make a profit. I do not think that this will not be great in the long run because of it being unstable. So what can be done to make it stable?
You can't really do that, because the market runs on its own.
well, therefore unstable prices cannot be controlled unilaterally.