I have a 2 in 1 tablet and no updates can be downloaded there because the hard drive only has 2GB free space… What can I do there?
(Except deleting things or buying a new device)
Delete unnecessary items or store them on a USB stick or similar. You have no other options
Delete things
Buy a new device
Install a new HDD / SSD, which should be quite tricky with a 2in1 tablet
"Stuff" also includes stuff in the trash, downloads, etc.
Do a disk cleanup with admin rights, that sometimes helps.
Your question is translated: "I have finished the cake - how can I continue to eat cake without baking a new one?"
Under the conditions you mentioned, that won't work.