Don’t buy cheap tablets, they’re never worth your time. Shop fleaBay for a Samsung Tab S6, S7 or S8 depending on your budget instead - you’ll be much happier with the outcome.
I’m still using my 2019 Tab S6 for Netflix, Reddit, PDF reading and annotation, comics and occasionally ebooks via KOReader. Great device, absolutely worth the ~$400 I spent on it on fleaBay ~3-4y ago.
If AMOLED is a must for you the Tab S6, Tab S7 Plus, Tab S8 Plus or Ultra and any Tab S9 model are where you want to start. I’ll replace my Tab S6 when the 11in Tab S9 drops below ~$400 secondhand.