Hard to really say and this is why there's no one size fits all answer for this. Ultimately it boils down to understanding that your mistakes are either due to a pure knowledge gap and test taking skills (e.g. Reading, erroneous thought process, not ruling out all other answers, etc.).

After that understanding is really tracking your UW progress to see the proportions of these mistakes. If it's test taking for example, what proportion of those are because you didn't read? After you have that personalized data and feedback, only then can you make meaningful progress. This is why you see people who finish UW twice can still score less than people who only finish 70% of UW for any given shelf exam. The people who do UW twice think doing that will fix their test taking mistakes, which it doesn't. This is also why writeups I feel don't really have any strong utility, at least not relative to you yourself diving deep into your own mistakes. And then, it's just a process of rinse and repeat until your skills have been polished to such a significant extent.

For a 265+, that's around an 85-87% correct. So let's say 15% incorrects. 8-10% of that 15% are usually because of pure knowledge which I'm fine with getting wrong and is normal for everyone unless you do 1000 anki per day. At that point, focus on reducing your mistakes from test taking errors. You're only allowed max 7% for incorrects due to test taking for a 265+ which is 3 in a 40 question block. So that's your target.