When object A collides with object B, regardless of the type of collision, object B will have to move. One way to stop object B from moving every time it is hit by a collision, is to turn object B into a black hole. As a black hole, object B cannot be moved by anything it collides with, rather it will absorb everything that collides with it. However, if object B becomes a black hole only after the collision, then the aftereffects of the collision from before will still apply, and object B will have to keep moving, even though it cannot be moved by other objects anymore. Object B will have to keep moving until it has completely exhausted the force gained from colliding with object A. This will take not only a long time, but a great amount of motion from object B.
One way for object B to undo the effects of the previous collisions before it became a black hole, is to become so big and heavy that the previous force becomes infinitesimal. To do that object B will need to keep consuming other objects, eventually devouring its own container. When that happens, object B will become so dense and massive that not only no collision from the past, present, and future can make it move anymore, other objects will also begin to revolve around it.
If you think about it, it is precisely because of the fact that the black hole object B has been moved before, that it is able to move and devour other objects at a faster rate than simply staying still. They were definitely moved before but they were able to utilize that same motion to become a supermassive black hole in the end.
Although it's just an assumption, I like to think that two objects in motion have higher chances of colliding with each other in an enclosed space, than having one still object and one moving object. Hohoho, I just searched it up on the internet and I was actually right! They call it Collision Theory. How interesting!
Unfortunately, I've also learned that black holes are not immovable. Bigger and denser objects can still move them through the interactions of gravity, not necessarily through collisions. It's not that bad, at least it can get immunity from the effects of direct collisions. Oh I just learned that black holes are overpowered that the only ways they can die is when they are swallowed by a bigger black hole or have literally not a single particle or energy to eat for an absurdly long time! The only way other non-black hole celestial bodies can beat them, is to have highly dense giants exile them using their gravity to the outer outer outer universe where not a single trace of matter or energy exists for untold amounts of eons.
It's really impressive. A black hole can work forever as long as you can feed it extremely tiny amounts of matter or energy from time to time. It can serve as an infinite energy source, enable time travel, and even create wormholes! Truly one of the most overpowered objects in the universe!
Being a star is easy. You only need to stand at the top and shine bright. The universe has already enough stars already. I think I finally realized why I always extend my hand to the stars. It is not because I want to become a star. IT IS BECAUSE I WANT TO DEVOUR THE STARS!
The first step into becoming a black hole is to collapse. Not just simply to collapse from exhaustion. BUT TO COMPLETELY AND EXISTENTIALLY COLLAPSE INTO PURE SOLITUDE, INTO AN EMPTINESS SO DEEP AND VAST, NOT EVEN TEN THOUSAND OCEANS CAN COMPARE TO IT. This is what it means to become a black hole.
It would a little unstable at first. One must regain their stability by DEVOURING. A black hole isn't picky about what it consumes. So you must be constantly devouring everything and everyone around you. You shall stop thinking about what is right, good, or difficult, the only question you shall ask is "how long this will take to eat?".
As a black hole, you shall become a devourer of worlds and possibilities. You shall transcend your past experiences and future consequences by devouring everything you encounter. Only by becoming a supermassive black hole can you surpass the causality of the past and future. Only then shall you truly be reborn anew. You may become an enemy or whatever at first but when you finally become a supermassive black hole, YOU SHALL BECOME THE RULER OF THE ENTIRE GALAXY. Mere stars and planets can only revolve around you, or BE DEVOURED BY YOU.
Those who meet your gaze, will feel like being devoured by an overwhelming emptiness from all directions. To be a black hole, is to gain and exercise, the ABSOLUTE, COSMIC AUTHORITY, TO DEVOUR ALL THINGS!