There are some possible improvements, but at that price point it is complaining at a high level:
Not a fan of Windows as a Server OS
Not a fan of Windows as a Docker host
Not a fan of none ECC RAM
No RAID
No IPMI
These cheap cases are a pain to work with
Possible vibration problems
Also check the fans RPM or the HDD temps from time to time. I am 99% sure that at least one of them will fail within two years
Not watched the whole vid, but maybe this is a good tip:
You have unused drives. Don’t put the actual working drives next to each other or even better, remove the unused drives and put the used ones apart from each other. That will help a lot with temps! People underestimate how much five drives can construct the airflow of a 120mm fan.
There are things you can do to reduce vibrations in a PC case, not so much in a NAS.
In my last built, I put silicon bands between HDD and case, and fixed the drives with zip ties.
I found in the local hardware store silicon and rubber chair feet, or L shapped silicon bands.
You can use silicon or rubber to dump anything - drives, fans, car engine .
My built running 2 drives is next to my bedroom. I don’t hear anything from it.