I would pick - change connecting words to show better relationships.
It's important for your paragraphs to be coherent, meaning they are well-connected. You can't talk about one thing and then about something completely irrelevant to that topic, without making a good transition. Changing connecting words such as thus, therefore, firstly, etc. will make a good start to make your paragraphs feel better-connected, in my opinion. I'm sorry if you got it wrong.