Good work there on being Proactive and suppling the Etrecheck Report 👍
This will cut out the back and forth question, answer and question aspect
From what I see from this report >>
Part 1 of 3
1 - This computer is in a dangerous situation where it is running out of Free Space
As the computer will struggle to find Empty Space to save all the changes to data, it will not function as expected.
If left unattended to, it may exhibit additional malfunctions and / or cease to boot up date all
disk0 - APPLE SSD SM0512L 500.28 GB (Solid State - TRIM: Yes)
Size: 499.96 GB
Free: 40.86 GB
Available: 43.82 GB
Part 2 of 3
Manage Storage
The links below will assist in identifying what is taking up space on the Internal Drive and provide possible ways to remove data that is under the direct control of the User ( Home Folder ) .
Rebuild the Spotlight index on your Mac
What is “Other” storage on a Mac, and how can I clean it out?
Free up storage space on your Mac
OmniDiskSweeper Safe to use
GrandPerspective
How to delete Time Machine snapshots on your Mac.
Often caused if the Time Machine Drive has not been attached to the computer and TM Backup is set to run on a Schedule.
TM Backup will make Snap Shot on the Internal Drive awaiting the TM Backup Drive to be attached.
Only then will the Snaps Shots be transferred to the External Drive and deleted the Internal Drive.
See used and available storage space on your Mac
Locate backups of your iPhone, iPad, and iPod touch
Notation - If the user is using a cloning software like Carbon Copy Cloner - suggest tweaking the Safety Net Feature in this software. It may be making additional Snap Shots that are not being Cloned to the Eternal Drive. If this should be the case, these Snap Shot could be using additional space on the drive
Part 3 of 3
Then there is the issue of a Disk Cleaner application called " DrCleanerProPlus "
Any Third Party Applications that will interfere with the normal operation of the OS, is an invitation for disaster.
Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale. What the Application may do to the computer is up to the User to check this out before purchase
Any of the below should be removed as per Developers Instructions
1 - Disk Cleaner
Dr Cleaner Pro Plus
Read some of the posting and arrive at your own conclusions.