User Manual Samsung SM-T290NZSAXAR galaxy tab a 8.0" 2019, 32gb, silver wi-fi

2GB(RAM) + 64GB storage for programs, up 512 GB for SD card.

Determine which apps are actually running, and remove those
that you don't need. If there are some that you don't need
because you do not have administrator status, then root the
device so that you do and can. If that doesn't resolve the issue,
then replace Android with LineageOS or with Replicant (each of
which is an open-source derivative of Android); either of these
will allow you to omit stuff hard-coded into Android. If that
doesn't work, then you are effectively out of options unless you
are willing completely to leave the world of Android.

If the DVD player is Bluetooth, but I'm guessing it's not.
There aren't ports in the tablet like there are on PC's & laptops.
There are adapters that can be purchased that can sometimes
fit devices like tablets, but this tablet has a micro USB charging
port, so it's more limited. USB-C charging ports, like on my 10"
Samsung tablet, offers more capabilities for adapter use.