My dad bought the car for me as my first car (2014 GLS) on August 2022 with aprox 99,000 kms on it, pretty good overall condition, BUT recently, my uncle (has an auto transmissions shop) checked the trans and said it seemed like previous owners never serviced the poor CVT

So, i thought the car was just a little slow, did terrible gas mileage (13mpg, 5.8km/l) and the trans was louder than a standard Automatic (little "weeeee" when accelerating, can barely hear it over the engine, but a loud "WEEE" when letting off the gas suddenly, somewhat like a turbo BOV), but now after DAYS of researching, i know a little more about these cars and i think it might really need a complete service (?).
List of problems:
1. Terrible gas economy (13mpg, 5.8km/l) I do mostly slow, short trips while on traffic, so thats probably the issue

2. Slow acceleration overall compared with other less-powerful cars (probably just the CVT

3. Car shakes while idling at 600-800rpms (doesnt matter if its cold or hot)
4. Noisy trans (not really thunderous, but definately noisy)
5. Some interior trim parts shake (Door cloth panels and glove box mostly, probably will get fixed with engine mounts)
6. Car doesnt like to go in reverse, it goes really slow and i have to press the gas sometimes. One time i got to reverse on an uphill road and it felt like it almost exploded lol (got the engine up to 5k rpms and barely moving)
7. NO BLUETOOTH WTF SUZUKI? Its a 2014, not a fucking 2003 (jokes aside, im replacing the stock radio with a Teyes CC3, really looking into that)
Now, im planning to do an engine oil change, possibly clean throttle body, change air filter and full CVT service, Ive read that for the CVT i need to flush and refill the oil several times to clean it, is this true? (sorry i really dont know sht about mechanical stuff lol) And i think there is 2 filters i need to change, but when i asked in the Suzuki dealership they told me CVTs only used 1 filter and its better if i used HONDA CVT FLUID, but i dont trust him at all

Oh and i want to add some wheel spacers to the back hehe

It would really help me if you guys could list some specs of the oil and parts needed for the CVT service and the engine mounts (ive seen the Eagle mounts are good, but idk).
Because the other stuff I want to do are relatively simple, so i think i can find it by myself

Sorry for the longest post on the planet and thanks in advance, have a good day.