I have recently been RTO'ed so I'm expecting to have a lot of time to read in coming months - yay for all transport between two points in London taking ~1 hour no matter what the actual physical distance - but in the last year I've been pretty busy with stressful projects and homelife, so feel lightly read compared to previous years.
Despite that, some recommendations:
First, remember that everybody's reading list is naturally capped. If it takes you a week to read a fiction book, and you're 30 years old, you have ~2,500 books left in your life. If you're closer to 50, it's more like ~1,500. And if it takes you a month to finish a book, you're at ~600 and ~350 respectively.
This means being picky is a necessity. Do not read books on "100 hundred books you must read before you die", style lists unless they all appeal to you. Do not try and cover the ground of every Nobel laureate unless you're a) a prolific reader, b) multi-lingual, and c) not easily bored. The same goes for any other prestigious prize, list, etc.
The most important thing is to read things you like reading. Don't read classics unless you like classics. Don't read sci-fi just because you work in tech unless you like sci-fi. I like a lot of contemporary "high brow" literature because I enjoy how people discover new ways to play with language to convey emotions. A lot of people find this incredibly dull, and that's fine.
You do you. You don't have time to read books somebody else says you "should" or "must" read.
One thing I think we can all agree on though is that almost all self-help books and airport style management or "popular science" books do not return the investment they demand. It's for you to decide how to interpret this, but please, read things that bring you a depth of joy not because they're popular or on a list or seem to be "everywhere".
For my style of reading, I like to get pointers from two magazines I subscribe to: The Literary Review [0] and Granta[1]. I am sure there are other sources for your preferred type of reading. Go support them. Be prepared to hand over cash to writers who publish a physical artefact, it's the only way they'll keep eating and doing that thing.
I would like to find time to add other magazines to my list (TLS, Paris Review, etc.), but I have limited time, these specific two tick boxes for me stylistically, have proven the test of time indicating quality, and even if I only find one or two books or authors a year out of them, have paid for themselves many times over. Further, I get a reasonable review of what's out there and can get a sense of what isn't for me, without reading it or feeling guilty about not reading it even though others tell me I "must".
As an aside, Lit Review's history reviews often are so good at covering the ground of the material the book covers, I feel like I've had a 1,000 word Cliff Notes version of the book in my hand and can decide to dig deeper if I want, but if not, I could understand a basic conversation about that topic if I needed to, and on occasion something I read has helped in a pub quiz.
One last point: try and break out of your echo chamber sometimes. It is easy to pick up and enjoy books that support one's own World view, but I like to challenge mine and keep it in check.
Reading the Communist Manifesto will not make you a Communist. Reading Mein Kampf will not convert you into a Nazi, because you have the perspective to rip it to shreds and see it for what it is.
Buying (OK, pirating, maybe you don't want to vote with your money in this category), books that heap praise on people you perhaps don't like or disagree with - Trump, Obama, Putin, Fidel Castro, Biden, Palosi, Blair, Thatcher, Pinochet, whoever... - these books will not make you those people or somebody who heaps praise on them. Develop the critical muscle to question things you read.
I say this because not only has this helped me navigate the news and political cycles of my life, but because it's helped me improve relationships with friends and family and even my reading of fiction.
Books really are the most marvellous things, and they all deserve more of our attention, even the bad ones.
[0] https://literaryreview.co.uk
[1] https://granta.com