GPU not being used

Unless an app is visible it may not need to use the GPU. If you are having system issues run EtreCheck to look for software issues. Post the report here using the "Additional Text" icon which looks like a piece of paper. If you give EtreCheck "Full Disk Access" it will also provide a summary of the recent system logs which may provide useful information.

You can also run the Apple Diagnostics to see if any hardware issues are detected.

Make sure your computer is backed up as your SSD is most likely failing. The Kernel Panic summary shows the crash was related to the SSD plus the write speed of your SSD is extremely slow as shown in the report. This model is known to have SSD failures and Apple even has a free SSD repair program for some of the laptops. Some of this model laptop also has a free battery repair program as well. Both free repair programs only cover the laptop up to three years after purchase. Here are the links to more information about these two free repair programs:

https://support.apple.com/13-inch-macbook-pro-solid-state-drive-service

https://support.apple.com/13inch-macbookpro-battery-replacement

FYI, here is the current list of the publicly acknowledged free repair programs for various Apple products (some products like your laptop have multiple programs):

https://support.apple.com/service-programs

Unless your laptop qualifies for the free SSD repair program you may have difficulty getting the laptop repaired due to the intermittent nature of the failure as many techs don't check or read the Kernel Panic logs much less understand how to interpret them. From my own personal experience supporting our organization's Macs (and even PCs) I can tell you the SSD is the most likely part which is failing since your Etrecheck report is otherwise clean with very little third party drivers installed. Keep in mind there are no guarantees, but in my personal experience the SSD is always the weakest link.

That is too bad. The free SSD repair program is only meant for a small number of laptops made at a very specific time/place. However, I have found some of our organization's laptops have bad SSDs that were outside of the free repair program. I suspect these laptops/SSDs have the same issue, but unfortunately they were not covered. Even the AASPs cannot give you any details since Apple doesn't disclose any details to anyone and only prompts the tech to check the SSD when checking your laptop when it is repaired for any reason.

Unfortunately this laptop uses yet another unique and proprietary Apple PCIe SSD connector and I'm not aware of any third party SSDs which can be installed into this laptop. I would hesitate purchasing a used Apple SSD since you won't know if the SSD was one which qualified for the free repair program since that program is based solely on system serial number (you won't know if it has the issue or not). Plus used Apple SSDs cost as much as having Apple or an AASP replacing the SSD for you.

While SSDs are nice for their incredible speed and lower power requirements I don't have a lot of trust in SSDs as I've seen far too many of them fail without any warning. It is extremely important to always have frequent and regular backups especially when using SSDs since they can fail at any time without any warning signs. Plus it is impossible to recover accidentally deleted data from an SSD after the Trash has been emptied. With most of the Apple USB-C Macs it is extremely difficult to impossible to recover data from an SSD if the Mac is not functioning even if you use an expensive professional data recovery service.

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