I believe so, but it requires specific steps for one method.
So, this is applied to users with user-IDs from 1000 to current one (meaning, all users that have an ID with a minimum of 4 digits). Now, the image may not be in full resolution, but it may be in its original ratio.
Take a look at your profile and ID:
https://kiwifarms.st/members/nuiis-clittysweat-droplets.199633/
Your ID is 199633.
Now, when you click on your image, you get this URL:
https://uploads.kiwifarms.st/data/avatars/o/199/199633.jpg?1750263826
Notice that all you have to do to access another user's PFP is to change the ID in that link, however another part of the string must too. For users below 1000, consider the
/o/nnn/ (n = number), the
nnn will be 0. However for users from 1000 and beyond,
nnn will equal the number before the 3 last digits of their ID, so in your case, you can see that it's
/o/199/ because your ID is
199633.
Now, take a look at this example, at user
LolcowsESL:
https://kiwifarms.st/threads/lolcowtubers-en-espanol.203988/post-21947042
They have their profile privated:
https://kiwifarms.st/members/lolcowsesl.182744/
You can right click on their image (in their posts), and it will lead you to their cropped image (192x192):
https://uploads.kiwifarms.st/data/avatars/h/182/182744.jpg?1752102834
Now, you'll see that all the work you had to do for changing the URL is almost done, as the string is valid, however instead of "o" it's "h" (or it may be "l"), change it to "o", the image becomes (384x480):
Notice that you don't need posts to access that URL, simply go to yours, and change it to "o", then change the ID, then change the "partial number" with the rules I described. That means mine would have (ID = 33143), and ("partial number" = 33), leaving it as:
https://uploads.kiwifarms.st/data/avatars/o/33/33143.jpg?1752102834
So apply to others.