"how do I make my footage look cinematic" was literally the first question I asked myself 14 years ago when I started. I now know the answer to that question, but it's not an answer, it's 700 answers. It's a college degree, and then a masters.
First things first, define cinematic. I wouldn't actually call any of the videos you posted cinematic. It's a word that gets overused to an insane degree these days.
What the cinematic look you see in movies comes from is not any one thing, it's the end product of getting dozens of things working perfectly in combination. There are some basic things we can help you with, like getting the best camera and lens combination at price x, but in truth, the largest obstacles you face are education and funding. Anyone without both will face difficulty achieving the look you see in studio films.
The education part at least, is mostly free, though there are some expenses as you go. I recently dug up this video for a friend, that clearly shows one of the core pieces of the puzzle, and if you take the time to fully understand this concept, and learn to use it all the time, it will go a long way towards giving you competitive visuals, and this requires no money. This clip is pretty basic, but it does a good job getting the central idea across.
Some super basic tips
Don't overexpose shots trying to get extra brightness, use your cameras meter as directed, and brighten in the colorist process. How this works is that anything that goes below or above your camera's range is lost, and cannot be recovered later, so if there is a light glare on your face in a shot that goes above range, you can't fix it.
Third lines - the "rule of thirds" is another cinematic basic. I never talk about it because most people know it already, but in case you don't this is ground floor cinematic method. Basically divide your frame into thirds, and place subjects of focus near the intersections of the lines.
This last one is a transparent PNG file, that you can download and use on your projects, just stretch it to fit whatever frame ratio you use, and layer it over your footage during composition, then remove before print. Once you get the hand of where things should be, you won't need to use it, but it might be helpful for a short while.
Third starter tip - An eye for composition. When you design a shot, you should always make sure that the subject is clear to the viewer. I don't mean make sure you aren't behind a lamp, I just mean that for a cinematic look, it should always be clear what thing on the screen you are supposed to be looking at.
good - lots of detail in this shot, but everyone is looking right at that character in the doorway.
bad - plenty of interesting things on screen, but what am I supposed to be looking at? It's not clear.
Anyway, I hope some of this is helpful to you. The good news is that composition and technique are actually more important than most of the things you have to buy, so you should be able to make some real progress without breaking the bank.