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There are many dedicated music players like that, that use micro SD. I have a Surfans F20, but I think it only goes up to 256gb SD card.

get one that has aftermarket firmware support, the ones i've played with have very specific conditions for folder/file naming and structure and format. The last one I tinkered with didn't support ogg vorbis out of the box, which is a somewhat niche format admittedly -- but support for it is fairly widespread elsewhere so I just sort of took it for granted that it'd deal with it fine.

I use this one:

https://www.amazon.com/dp/B01LZVDMEL