I've had the same Kindle as you do and yes, it slows down considerably with a lot of books.
Newer ereaders are certainly faster. That said, the fastest ereader I've had is the most recent Kindle Oasis. It's noticeably faster than my Kobo Libra. But it cannot read epubs natively and its collection management is about the same as on your old Kindle. So I'd also say a Kobo is your best option.
You can convert your Kindle books to epub/kepub for the Kobo.
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