There is always going to be some level of interpretation. You are looking for an absolute truth that, while it may theoretically exist, cannot be reliably perceived through a human lens, which you are guaranteed to have at least 1 of (yourself), and almost certainly 2 (the source), and maybe many, many, many more in between.

Imagine you had a time machine that could bring you back into whatever time you’re interested so you can watch it unfold first-hand. Ok, great. But do you trust your eyes? Did you see everything that happened? Even if you can invisibly go and explore the aftermath. Even if you can go back to the same point 100 times, 1000 times, and meticulously detail everything you find. Do you now have the perfect and unambiguous truth? Of course not. You can make mistakes, you can misunderstand. Even our eyes lie to us. Even our brain misremembers things. Different people using the same time machine to travel to the exact same point in time may see what happens in an entirely different way, may see things that you did not see. Who’s right?

I know you think you’re looking for the absolute unvarnished truth, but you are chasing a phantom. Your goal is not realistic. At some point you have to arbitrarily accept and define what errors and limitations the sources you’re drawing your understanding from might have, and attempt to make your own interpretation of what the facts actually are. You will never know what really happened with absolute certainty. Absolute certainty is its own kind of myth and there’s some very fundamental metaphysical reasons for that. You’re not going to find a magic textbook of trustworthy history that solves that problem.

Understanding history is a process that requires connecting many different pieces of variously flawed contexts and information to paint your own, interpreted but hopefully relatively accurate picture. No matter what book you read, you cannot guarantee its accuracy and it is a fool’s errand to try, but you can continue to try to collect more evidence, more pieces of context, more clues to add more details to your picture. Perhaps you will never be satisfied with the detail of the picture you’ve created, sometimes you will have to throw your whole picture away and start to create a new and different picture on the basis of some details you find that don’t fit. You’re never going to have a perfect picture, but I think a lot of people have managed to create really pretty good ones based on a whole lot of research of many different sources and pieces of detail, not just written records alone but cultural references, archaeological artifacts, scientific analysis, and sometimes just assumptions about basic human behavior. You just have to learn who and what you can trust and how far you can trust them. Both as sources, and as interpreters. And you are always welcome to argue you own interpretation.