Thanks for posting the EtreCheck report. Most likely CleanMyMac is causing most of your problems so uninstall it by following the developer's instructions. This app is notorious on these forums since after uninstalling CMM most users see a marked improvement. Anti-virus apps, cleaning apps, and third party security software are not needed on a Mac and usually causes more problems than they solve plus they impact system performance and interfere with the normal operation of macOS.
Also you should uninstall Adobe Flash since Flash is no longer supported on any platform. Flash has always been a huge security risk even when it was receiving security updates from Adobe. Be sure to follow Adobe's instructions for uninstalling Flash.
Some of the error logs show that memory was improperly modified which is usually caused by apps like CMM.
The report also shows your Mac is starting to use some Swap which can slow down a Mac even when using an NVMe SSD like your laptop is using. However, without seeing how or when Swap started to be used, it is hard to say how important this is. I'm just mentioning it since at some point in the last three days something you did used enough memory to start swapping memory to the SSD. Perhaps this is just a side effect of CMM, but it may be something to keep an eye on while using the Mac. You can use Activity Monitor to monitor the memory usage. Besides the memory pressure (yellow or worse red), seeing GBs of compressed memory or Swap is usually a sign that you don't have enough memory for the the workload/workflow. Unfortunately you cannot upgrade the memory on your laptop.
You should also check to see if your laptop qualifies for this Battery Recall Program (not all laptops have the issue):
15-inch MacBook Pro Battery Recall Program - Apple Support
FYI, here is the current list of the publicly acknowledged free repair programs for various Apple products (some products have multiple programs):
Apple Service Programs - Apple Support