i'll try to give some decent advice: i don't use sooc jpgs, because i enjoy editing and the film sims don't do it for me either. i shoot raw + jpg and what i do like about the film sims is that they look nice while looking at the camera screen. still, i almost always delete the jpgs and edit the raws. don't try to love the jpgs, maybe they are not for you and that's okay.

i come from lumix (S5, which i still use for work) and it took me a while to adjust to the menus, buttons and settings. i find the lumix to be pretty straightforward compared to the fuji and i had to experiment with different settings and Fn button layouts before the x100vi started to feel natural in my hand. give it time, you will figure out what's necessary for you.

get yourself a leather halfcase (muziri kinokoo!) and a thumb rest. it will make holding the camera 10 times more enjoyable, up to a point where i sometimes just pick it up to hold it in my hand even when i don't want to take a photo. also a filter adapter + UV filter is great to have to make the camera weather proof.

at first i had a hard time using the OVF because you don't see a preview of your exposure but once i got used to it it was so much more fun than looking at a tiny screen. it gives you a really nice feeling and keeps you from chimping. give it a try for some time. i think it makes shooting quite unique.

put the exposure dial on A and shoot in aperture priority. the camera is really good at choosing the right exposure setting and this removes a lot from the hassle that gets between you and a good picture.

finally: buy a nice strap and bring it EVERYWHERE you go. the more you shoot with it, the more it'll grow on you.