How do I stop HS from having repeated kernel panics and other crashes?

I'm sorry if this is vague but I'm getting desperate and it's affecting all of my Macs.

Since High Sierra my Macs started restarting for no apparent reason, my desktop mac, an old 2011 27" iMac also started displaying video glitches specially more so when it was about to have a kernel panic.

I discovered that if I disconnected and connected again --oh, it has a Thunderbolt Display attached, I forgot-- the Thunderbolt Display the main display recovered its pristine image, no flicker or glitches, same thing on the external display. It didn't always work. And if you noticed I'm speaking in the past tense it is because I solved it...by switching to Microsoft Windows--Windows Server, actually, other than the two days that took me to set it up thanks to Apple's super custom kexts drivers and the Server OS that refuses basically everything you throw at it.

I work a lot with servers and virtualization anyway so it wasn't much of a disadjustment, mostly home control and little things like that but there's Alexa for that. Anyway, my real concern is actually because of home control/automation; for systems automation I use Indigo Pro, this only runs on a Mac, and the four Macs sitting on the server rack have become unreliable, the one on my desktop is now stable but no longer runs macOS and I don't have more desktop Macs left and even if ran to get a new Mac I'm sure the same would happen, my main portable a recent high-end retina is also doing the same thing! 😡 It's not an issue of tier, form factor or even generation; it's High Sierra that has finally "elevated" Apple to the lows of Microsoft OSes, unstable, glitchy, cumbersome and the worst of all: prompty. macOS now feels like Windows Vista with all the questioning and the incessant need for some pointless restart. I used to for more than half a year without a restart on the Snow Leopard era. Ironically Windows is the thing that's keeping my desktop alive. A very expensive server license. I would've liked better Fedora or maybe RHEL but I was thinking on regaining access to my iTunes Match library, there's no iTunes on Linux (for better or for worse) only to find out I reached the activation limit because I didn't deactivated iTunes on macOS. Apple has not responded my support request.

Where does Apple store the system files that could be affecting video? I'm sure it's something graphics related from what I experienced with the iMac. If macOS has BSD/UNIX underpinnings, do you think with zero programming experience or knoledge if I get very high and don't sleep for a week straight I could come with some kext of my own from what's available on sites like RPMFusion.org? 😂 I actually installed FreeBSD on a Mac and lasted for a good 20mins before I decided it was too ugly.

Months earlier ALL of my Macs were running super hot and after weeks of watching the processes on Activity Monitor and using Terminal I figured out it was yet another badly written program that syncs iCloud Keychain and to do so it encrypts data on the fly but it could finish or something, I just killed with a ton of Terminal windows and erased Keychain Access which wasn't fun either bc I have several custom certs for Profile Manager--it took me forever to work against High Sierra that wouldn't take them back until I reinstalled the whole OS. So much for allegedly glitch-free APFS. 😒

What happened to Apple. 😟