Suddenly you realize you’ve explained something differently or too many times in different chapters, or you find some blatant contradiction that you’d never seen between chapters 2 and 5.
I will be finishing writing my thesis on this new topic, but much of the work I have done have not been checked by anyone with a Ph. Or should I seek out more professors who are more familiar with this new topic and try to have them read it (it would take at least several hours to do this and, keep in mind, I am not a full-time or even part-time student right now)?
Moreover, I have been late in turning in my thesis for several semesters since I've also been working full time much of the time after I finished my B. This makes it feel like my university does not really care about my success anymore and I am not even being pressured to finish writing my thesis as I would have been if I was a full-time student. Should I just crowd-source some comments for editing my thesis from friends and try to just get it turned in and accepted so I can present?
If you don't know any professors who are expert in your topic, then after your advisor gives you his feedback, ask him: "Do you think we should also send this to an expert in the topic for review?
finishing up, advice about the end tends to go in one ear and out the other.
It will also help if you identify and tell him about the areas where you think you most need extra high-quality feedback: "Could you tell me what you think of the formulation in Section 3, I'm not so sure about that part." Even though your advisor is not an expert in your new topic, he's an expert in and he knows what good work looks like.
He knows when an argument seems weak and "hand-wavy" and when the evidence on offer doesn't support the claim.
Having said all that, it's still useful to get comments from others in addition to your advisor.
Ask your friends to read your thesis to (1) find typos and obvious mistakes, and (2) note areas where they think something is unclear, so you can improve the writing.
Coming to writing a thesis: Firstly, build a workflow of what you are going to be turning in, starting from intro, your goal, what you do, how you do, how is it novel, conclusion, summary, future enhancements.
Once you figure this out, a good idea would be start taking one chapter at a time. So, please refer to papers / thesis which encompass the topic you are working on.