Extruded text with holes. How to correct?

I’m an absolute absolute beginner with Blender. My question is maybe very primitive but I didn’t find a way to solve by myself.
I have extruded text and now some letters have holes in it, so that you can look through. Other letters are good. All letters have the same axle displacement.

Any help would be really great!

Thanks in advance!

HMMMMMMM. Not too sure but would be happy to take a look at the .blend file if you’d like

Convert it to a mesh (Alt C), add a Remesh modifier. Play with the settings, then apply it. This should give you evenly spaced faces/vertices…