MP with randos is kind of dead on PC, I find it easier to find players for specific hunts on Switch.
Most monsters at most have 2 attacks combos when enraged with rare cases of 3 (on top of my head Aknosom and Zinogre). In the case of 2 attacks combos you need to tackle the first attack and then SAS the second.
That comes with getting familiarized with the monsters' move set. It's kind of like CPP for Charge Blade where sometimes you need to GP and then CPP some monsters attacks.
Changing your steam download region (take a minute or so) does seem to increase how fast you get paired and cause less timeouts/error code. I get good results depending on when I play.
Also the only other MH on switch is XX/GU hence why it feels like Rise is more populated on the switch.