Late 2015 iMac extremely laggy. Upgraded 1tb SSD and upgraded i7 CPU

I am officially at a loss on how to fix the speed of my late 2015 imac. I have opened this computer and added a SSD, which is a Samsung SSD 970 EVO 1TB. I have updated the CPU to an Intel 4ghz i7.

As of this morning, I've updated the Ram from 16gb to 32gb Crucial DDR3L 8gb sticks.

None of this has helped. The Kernel_task revs up randomly and I'm 'pulling out my hair out.' I don't understand what can be causing this. I use this machine mainly for the internet and Adobe Suite. When I first updated the hardware there was no issue at all. I was able to edit video and photos fine. Now...It's been abysmal to say the least. I am considering rolling back my OS as perhaps that may be the issue? I am on Monterey and think it may be the issue.

When I first completed the hardware install the computer started up in a flash. Now it takes upwards of 2-5 minutes before I see the users. I can maybe ditch chrome and use another browser if that's the problem? Chrome has 10 tabs opened currently

I have tried clearing the cache in the past and haven't seen a vast improvement.

While I was running this test the kernel_task was at 500%. In the report it doesn't show that. I was having a very laggy time even typing out this post.

Needless to say, I am lost. I would be so appreciative for any advice this community would lend me.