I disagree a bit that more recent dystopian stuff is automatically less heavy - there's quite a lot out there that's just as dense as 1984, you know. but I thought Margaret Atwood's "The Handmaid's Tale" is a good starting point if you want to keep that oppressive atmosphere but with a narrative that flows better. it's concentrated, it doesn't have those stretches of political manual that wear you down in Orwell, and the social criticism is just as sharp. there's also Huxley's "Brave New World" if you haven't read it yet - it's from 1932 so it's not that recent, but it's completely different from 1984 in tone. less pessimistic, more disturbing in a way that doesn't drain you while reading.
if you want something more modern though, Yevgeny Zamyatin's "We" is short and way easier to process than 1984 even though it's from 1924. then there's Bradbury's "Fahrenheit 451" - it's even shorter, less political and more focused on the story itself. now, if you're open to something really recent and not so exhausting to read, it depends a lot on what you mean by "not so heavy". some people think any dystopia is heavy, some people want to stay at that 1984 level but written differently. what's your cutoff? do you prefer more modern prose or is classic fine as long as it's not a slog?