Living with ADHD and OCD means periodically I develop (and get overly-excited over) a new, elaborate organization system that I somehow, foolishly, believe will last forever.
However, this week I've got a tremendous new system that I think may last forever!
The Tremendous Development!
You can now write and preserve data in a physical, human-readable format that's immune to hard drive failures! And it's like, right there in front of you so you're less likely to forget about it!
But the best part is...
These Don't Suck!
Remember these 99 cent bois from grade school?
Garbage.
But TankieTanuki, those are the cheapest ones, which means they're the notebooks of The People!
No. Full stop. Don't even.
You're an adult. Your thoughts are worth preserving. These aren't diamond-encrusted—it's like paying twice as much for the boots that last ten times as long. These were not expensive: The A6 ones were about $3.00 each and the A5 were $5.50.
Do you think Stalin's commissars were recording state grain quotas on those shitty McJournals where the spiral falls out the fourth time you open it and the ink bleeds through three pages at a time?
No.
Stalin would have shot your ass for doing a shitty job and you'd have deserved it.
Cool Features
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Thick Paper
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Hardback
The book is its own clipboard! Vegan leather (aka plastic lol 
). Bound securely with string 'n' stuff.
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Adorably Smol
A5 for studying. A6 for writing down bit ideas or memos.
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That's right. Those are mother-fucking DOTS on those pages!
You can draw technical shit like tables better because of the vertical guides, but it's less conspicuous than grid/graph paper.
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PAGE NUMBERS!!? You better believe it. Leverage the power of INDEXING!
Also the red A6 one looks like Quotations from Mao Zedong.
I may start getting into fountain pens now. Lord, help me. 
My only possible addition is: if you're really going to go through these notebooks often (or even just, not going to be wearing out the covers every time), consider getting a reusable outer cover and just buying refills that are just the pages and a simple binding
Someone on here recommended it to me, but I fill a moleskine about once every couple years so I haven't tried it out yet.
You can get ones with clasps almost like little 3 ring (6 ring ig?) binders, or just slipcovers. Aliexpress seems to be the spot.
No grid paper on these but all other options are there: https://www.aliexpress.us/item/32865900837.html supposedly really nice quality paper on these but again I haven't tried them yet
slip cover: https://www.aliexpress.us/item/1005007347218116.html
Book refills are a thing?
I don't fill them that fast. I also like the idea of archiving them on a bookshelf eventually.
I would say the refills are robust enough for a bookshelf! they still have a paper dust jacket it looks like, just not as durable as plastic or pleather
But yeah, judging by the number in the OP you've probably got plenty to last a while like me