I've been days trying to avoid my work for days. I've been trying to avoid my work for days.

you are avoiding the work, not the day

I've bespent days trying to avoiding my work. I've spent days avoiding my work.

People called this "procrastination". People call this "procrastination".

people still call this procrastination, so it is not past tense (called)

People called this "procrastination"." People called this "procrastination."

I looked up for this word in a dictionary and the definition was the same thingdescribes what I was doing. I looked up this word in a dictionary and the definition describes what I was doing.

I looked up for this word in a dictionary, and the definition was the same thing I was doing. I looked up this word in a dictionary, and the definition was the same thing I was doing.

In these days I read "la metamorfosis" by Kafka, and, to be sincerehonest, it's not a great book. In these days I read "la metamorfosis" by Kafka, and, to be honest, it's not a great book.

sincere is not exactly the right word to use in this sentence

In tThese days I have been reading "lLa mMetamorfosis" by Kafka, and to be sincerefrank, it's not a great book. These days I have been reading "La Metamorfosis" by Kafka, and to be frank, it's not a great book.

My rephrasing and tense change here is to make the sentence sound more natural

Then I searched in gGoogle why this book is so famous, and I found out that I interpreted the story in a different way than everyone else. Then I searched in Google why this book is so famous, and I found out that I interpreted the story in a different way than everyone else.

You could also say "I Googled" - it's very common phrasing.

For me, from now on his family would be more active and owners of their own life. For me, from now on his family would be more active and owners of their own life.

I'm exactly sure what you are trying to say here... Sorry

For me, from now on his family would be more active and owners of their own life. For me, from now on his family would be more active and owners of their own life.

I'm not sure what you mean here.