In addition to @D.I. Johnson's analysis and advice, I would like to point out the following:
To delete the items mentioned in the "Clean Up" section of the EtreCheck which don't show the location of the item, you need to locate the item earlier in the report to know which section the item is reported and translate that section into one of the following locations which will contain a .plist file:
/Library/LaunchAgents
/Library/LaunchDaemons
~/Library/LaunchAgents
Two of those items are listed as "running" so they cannot be deleted until they are turned off.....you may need to delete them while booted into Safe Mode which should disable them.
You have a lot of software installed which has installed things to run in the background. This will consume system resources and increases the chances of issues with macOS & other apps including performance issues. I would highly recommend uninstalling BitDefender by following the developer's instructions (just deleting the app to the Trash is not enough due to all the tendrils BitDefender has put into macOS). Anti-virus apps, cleaning/optimizer apps, and third party security software are not needed on a Mac and will usually cause more problems than they solve, plus they impact system performance. See the following article for more details:
https://discussions.apple.com/docs/DOC-8841
FYI, TechToolPro (aka "micromat") is really a waste of resources. I was never a fan of TTP even 20 years ago, and am even less of a fan today after seeing a recent version a few years ago. TTP does a lousy job with all its "features" which is better done by other....usually individual specialized apps.
Plus I see multiple VPNs listed in the report (may only be browser extensions....I got lost in the report with all the things running in the background). VPNs are only useful for connecting to an employer's network. Most VPNs do not provide the privacy or security you think they do. See the following article for details & information:
https://gist.github.com/joepie91/5a9909939e6ce7d09e29
As for your "out of application memory" issues, you should update to macOS 26.2. I also experienced lots of those issue as well as storage issues. So far I have not experienced those issues since I updated to 26.2.
Make sure your third party apps are completely up to date and compatible with Tahoe.....and with the macOS 26.2 update.
Edit: I see respected contributor @etresoft beat me to posting. Please follow their advice regarding deleting the extensions since they know much more about such things.