Updating the Android OS on a Sumtab brand Tablet

I have an Android Tablet under the brand Sumtab model K_101 PRO. I purchased it in October 2020 and it uses Android 9.0. What I notice is the battery for the past year drains faster than in the past and Android 9.0 may no longer receive security updates. When going to the Settings of the tablet is says the system is up to date. The brand has no website. Is there a way to upgrade the tablet to a more recent Android version?