First, there is no reason to ever install or run any 3rd party "cleaning", "optimizing", "speed-up", anti-virus, VPN or security apps on your Mac. This documents describe what you need to know and do in order to protect your Mac: Effective defenses against malware and other threats - Apple Community and Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support.
There are no known viruses, i.e. self propagating, for Macs. There are, however, adware and malware which require the user to install although unwittingly most of the time thru sneaky links, etc.
Anti Virus developers try to group all types as viruses into their ad campaigns of fear. They do a poor job of the detecting and isolating the adware and malware. Since there are no viruses these apps use up a lot of system resources searching for what is non-existent and adversely affect system and app performance.
There is one app, Malwarebytes, which was developed by a long time contributor to these forums and a highly respected member of the computer security community, that is designed solely to seek out adware and known malware and remove it. The free version is more than adequate for most users.
With the being said you've installed what many here consider akin to malware: CleanMyMac. You've also install some other unnecessary software, Kaspersky. Just so you know the US government has banned all Kaspersky software from their computers. All they do is mess up your Mac's performance and lighten your bank account.
Uninstall them according to the developer;s instructrionsl
Sine you have such a small SSD in the MBA you might consider this: 250GB OWC Envoy Pro mini . It's small and you cn easily carry it with your MBA. It can hold your Photos library and other files to free up your boot drive so it will work more effectively. Just some food for thought.