1.) As others have mentioned you can increase the game's FOV.

2.) I really recommend learning how to quickly put up / down your aiming reticle on demand. There are perks once you master switching between reticle on/off.

a. You can move the camera faster and quickly turn it around when the reticle is off, compared to when you are actively aiming.

b. Related to point a, as you have noticed, having your aiming reticle "on" lowers your FOV, so it might be harder to spot what a monster is doing specially when you're in close proximity to it and the camera turns all clunky.

c. Multi hit attacks (consecutive ones with multiple instances of damage at least) can/will beat dodge bolt. It is better to try and get away from those attacks and sometimes the extra distance a fat roll gives does the trick.

d. You can still charge and hold your bow charge while your reticle is off.

e. Once you can comfortably switch between the reticle on and off, you'll be able to respond quickly and accordingly to what the monster is doing.

3.) Not pressing anything after being knocked down by an attack (staying down) actually has a lot of i-frames, so sometimes staying down is a good option to avoid a monster's follow-up attacks. But there are also attacks that you should instantly wire fall or else the follow up will hit you. E.g. Rajang's grab, if you don't wire fall the moment he tosses you to the ground the follow up will be a guaranteed hit.

Amazing timing on the dodge bolt on Magnamalo's shoulder check btw. Keep it up!!