Try to shrink this:
It's easier than making something bigger.
The black outline need some manual work to make it blocky if it's wanted. But test, if this is useful. The white fill should be exact - it's not copied from elswhere, it's from your image, only the anti-aliasing is quessed and taken back. It didn't work perfecly to the outline that had sharp blocky outer edges. I put a new smooth outline.
NOTE: Download this PNG, if you copy and paste it, the result is random. Probably you lose the transparent background.
Your original small r was enlargened to 800% pixel dimensions. There are many good resizing programs that quess the missing details and can take back some obvious anti-aliasing. On1 Perfect Resize was used here. The result:
The outline isn't especially nice, but there was no glue to do it otherwise. The interior was anti-aliased. On1's resizer by default thinks the interior has originally had a sharp edge.
I selected the interior, smoothed the selection (not blurred nor feathered) and painted it full white. Then I took the interior to Inkscape (=Ctrl+C, Ctrl+V)
In Inkscape I traced the interior with default settings. See the following cartoon:
The enlargened r with whitened interior. This was not traced!
The interior after the tracing, turned to black and a thick black stroke was inserted
The interior after the tracing, only white fill, no stroke
this is 3 and 2 piggybacked, the same as already offered to be shrinked
ADDENDUM: On1 Resizer is a high cost program. There's also usable freeware. I have tried Smilla Enlarger. https://sourceforge.net/projects/imageenlarger/
Its results are a little softer than On1's. But they can be sharpened. Smilla seemingly tries to quess also what's behind the blocky outline of your r. Heres a enlargening result which is made in Smilla and then made sharp in GIMP.
NOTE: This is bitmap, no tracing attempted.