Calculation reminds me of doing long division in your head. You have to concentrate and not lose the thread of the way its going to go. You should be as concerned about threats as much as your own plan. It can be simplified by coming up with two what you think are best candidate moves. That way you don't have to calculate everything.
Think Like a Grandmaster, Alexander Kotov is a famous book that covers candidate moves. It's an advanced book though. This book is not without its critics. There are probably better books out there on the subject. I remember Silman writing about candidate moves.
https://www.amazon.com/Think-Like-Grandmaster-Batsford-Chess-ebook/dp/B00PPH2Q8W/ref=sr_1_1?crid=3OMM52IJDY81C&keywords=think+like+a+grandmaster&qid=1695634228&s=digital-text&sprefix=think+like+a+grandmaster%2Cdigital-text%2C201&sr=1-1
https://www.amazon.com/How-Reassess-Your-Chess-4th-ebook/dp/B00M9WCX7A/ref=sr_1_1?crid=SZA3NN2P7SXE&keywords=How+to+reassess+your+chess&qid=1695635633&s=digital-text&sprefix=how+to+reassess+your+ches%2Cdigital-text%2C183&sr=1-1
These are hard books.
I'm 900 elo hard struck. It's hard to remember long calculations. I'm trying to do puzzles and I'm struggling. Is there any tips i can follow? While calculating i have to remember temporary positions and permutations and combinations it's hard.