If it helps anything at all: It's normal. At this point, you've already proven you're smart and knowledgeable. Now, the universe wants to see if you can also finish what you've started. That's the main thing a PhD proves: That you can take an incredibly interesting topic and then do all the boring stuff that they need you to do to be formally compliant with arbitrary rules.
Focus on finishing. Reduce the scope as much as possible again. Down to your core message (or 3-4 core messages, I guess, for paper-based dissertations).
Listen to the feedback you get from your advisor.
You got this!
When I did my MSc thesis he told me it was a pretty good PhD. (Before giving me a months work in corrections.) I didn’t understand back then, but I understand now. It was small, replicatable and novel (still is)! Just replicate three times and be done with it. You’ve proven your mastery. Now start something serious.
My professor once told me he presented at a small conference, the whole audience everybody had PhD in mathematics and maybe 2 of the 50 or so people in the audience could follow along. The point he was trying to make is at some point the people in the audience were not really interested in what was being presented because it is difficult to just follow along some really niche topic.
He discussed this topic and how generally it's left to those who are more notable in a field to ask the 'dumb' questions everyone else is afraid to ask. And such questions often need to be asked to get the audience on board and open the floodgates with areas of niche research - the speaker themself is often too far into the rabbit hole to discern the difference between opaque and obvious.
So it stands to reason, at smaller conferences this would be a big problem, with fewer thought leaders in attendance whose reputations are intact enough that they wouldn't mind looking foolish.
in my field this would be terrible advice. instead you need to be doing something that your audience actually will give a shit about.
If there is something interesting enough to qualify, then reduce the scope as much as possible. It should go without saying that you shouldn’t throw out the interesting bit.
But there's some things to remember that are incredibly important
- a paper doesn't *prove* something, it suggests it is *probably* right
- under the conditions of the paper's settings, which aren't yours
- just because someone had X outcome before doesn't mean you won't get Y outcome
- those small details usually dominate success
- sometimes a one liner seemingly throw away sentence is what you're missing
- sometimes the authors don't know and the answer is 5 papers back that they've been building on
- DO NOT TREAT PAPERS AS *ABSOLUTE* TRUTH
- no one is *absolutely* right, everyone is *some* degree of wrong
- other researchers are just like you, writing papers just like you
- they also look back at their old papers and say "I'm glad I'm not that bad anymore"
- a paper demonstrating your idea is a positive signal, you're thinking in the right direction
Combine that with the publish-or-perish paradigm and I think we got significant coverage. People don't even consider diving deeper into things and are encouraged to take the route of "assume paper is correct" because that's the fastest way to push out research. But if the foundation is shaky, then everything built on it is shaky too.
Which, that's a distinction in the hard and more formal fields like math and physics. They have no issues pushing out papers that may have errors in them because the process is to attack works as hard as possible. Then whatever is left is where you build again. You definitely have people take advantage of this, like Avi Loeb publishing about aliens, but it is realistically a small price to pay. And hey, even Loeb's work still contributes. If at some point it actually is aliens, then there's work existing that can be built upon. And when it continues to not be aliens, there's existing work to build on since really his problem is more that the papers just end up concluding "and this is why we can't rule out aliens!" (-__-)
Anyways, long story short, my advice is to just remember that you, and everybody else, is a blubbering idiot and it is a absolute fucking miracle a bunch of mostly hairless apes can even communicate, let alone postulate about the cosmos. At the end of the day we're all on the same team, seeking truth. Truth matters more than our egos and if we start to forget how dumb we are then we'll only hinder our pursuit of truth.
Acknowledge it is normal? Attempt to buy deeper into the delusion ("Yeah my work is awesome and unique!"). Use stimulants to force enthusiastic days every once in awhile?
Uhh... unless you plan to stay in academia? Then, this is a terrible idea.