As for the fans, I'd really recommend taking a look at all the data, in one place, and making an informed decision.
If you look at individual fan speeds, individual component temperatures, and ambient temperature, and cpu load, you can decide if the fan is running faster than it needs to be or not.
If it is, you can customise that with some fan control app.
If, for example, CPU temps never go over 40C ish but the fans are just too loud,
then the default profile can most likely be made less aggressive.
1: Carefully make sure the CPU heatsink isn't loose.
2: Make sure there are no obstructions over/near the fans. (cpu+case)
3: Make sure none of the fans looks, or sounds, broken.
4: Tune speeds according to temperatures under load. At this stage you can control the fans one by one and figure out which one is the main offender.
5: If things still aren't good, and you're comfortable doing it, renew thermal paste and ensure that CPU heatsink fins aren't clogged.
If it's still loud after that maybe consider replacing fans/cpu coolers with better parts, adding an additional case fan, or just giving up on it.