Doesn't belief in the PSR, plus the desire to know more, mean that you'll never let anything be a brute fact?

I'm not sure what you mean by "let" in this context, but I'll assume, pending correction, that by "let anything be a brute fact" you mean "affirm the existence of a brute fact." If I correctly understand what the PSR is all about in any of its versions, it includes an assumption that brute facts do not exist. If I assume that no brute facts exist, then I cannot affirm that any brute fact exists without contradicting myself.

Doesn't belief in the PSR, plus the desire to know more, mean that you'll never let anything be a brute fact? And so if you never let anything be a brute fact, it would mean you are acting as if:

     (1) you want to learn more about everything†
     (2) you do not accept any brute facts

† Of course you may care much more about learning in some areas than others.

Insofar as I can discern my own thinking and understand my own behavior, I never act as if it is either true or false. I am as susceptible any anyone else to self-deceit, but that is how it seems to me. Epistemologically speaking, the PSR is just irrelevant to me, as best I can tell. One reason for that is, as I mentioned just a short while ago in another post, that the PSR seems to be empirically unfalsifiable.

How often do you act as if the PSR is false?

So … you don't think scientists can currently [justifiably] declare anything a brute fact and you're skeptical that they will ever will, but you want to keep open the mere possibility that maybe they will?

I can think of no way that scientists could ever distinguish between an actual brute fact and a phenomenon that they were simply unable to explain because of their human cognitive limitations. That being so, no empirical discovery could ever falsify the PSR.

That mere possibility is enough for you to utterly discount the PSR?

I don't know if I utterly discount it. I don't accept it because none of its defenders has shown me a good reason to accept it.

Im just having fun too .no a belief that not everything has a reason is not a belief that nothing has a reason. And so there is no contradiction if to say the following: A is a brute fact, B is my belief that A is a brute fact, and B is not a brute fact. C is the reason to hokd belief B. No contradiction. Nothing incohetein .

Do I think beliefs like B exist or are justified no, nor do I think they are likely to become so. But this is not my burden as lacking a belief in the PSR .Rather it is your burden to show that A is impossible or unlikely. You've already agree that A is coherent.

To those using good reason it is self-evident ;)
I'm just having some fun!

How do you know this belief is not a brute fact?

In all seriousness, you've realized the problem here!
This is why belief in the falsity of the PSR is self-contradictory and self-undermining. Belief that the PSR is false undermines one's ability to even say it is false. Self-undermining (also known as self-contradictory beliefs) are incoherent.

So unless one believes one ought to hold incoherent beliefs, then the belief that "the PSR is false" ought to be rejected as incoherent.

No it is not self-evident or a first principle. How do you know this belief is not a brute fact?

"Only through such beings does the universe come a full circle, back to its origin, back to the consideration of the mind that made it. The purpose of the universe is to create minds similar to their maker and for those minds to seek their maker out through a progressive comprehension of its workings"

I like this, especially a "progressive comprehension of its workings".
A wide angle view like this takes care of so many of Christianity's so-called classic problems.

PS. I doodled around here on SN as "Lazarus" a year or so ago. I have somehow managed to delete that account, so in creating a new one I thought that I may as well use my real name. I hope to have a bit more time to post now.

It is a self-evident first principle, being cannot come from non-being. From nothing, only nothing comes.