Having done traditional inking for my first comic (and all of the ones before that when I was younger), I have the following suggestions (all have been stated above as well, but I'll toss my 2 cents in anyways haha):
1.) Try a "stronger" ink
For my first Tapas comic, TreasureHUNT!!, I ended up gravitating towards using a dip pen with deleter ink instead of fine liners like I always used to use. I had some issues with my prior comic project with fading lines, and found that those more traditional types of inks dry a little thicker and harder, such that unless you physically chip away the ink, it maintains a nice pure black quality. It's harder to work with but the line quality was awesome~
2.) Try a softer eraser
As others have suggested, sometimes drawing erasers can be a little too hard and can pretty easily erase away part of the ink as well. Kneaded erasers, or even just really soft non-kneaded erasers can possibly aid in this.
3.) Non-photo blue pencils
If these work for you, they erase (pun intended) the issue altogether by removing the need for erasing. When I tried these, though, I found it too difficult to actually see the sketch clearly while inking because it was too light, leading to a number of inking mistakes...
4.) Ink from a digital sketch
I don't actually think this was mentioned above, and probably for good reason- I'm probably the only person too stubborn to do this
For the last 10 or so pages of my comic, I was getting frustrated with the blue sketches but was also frustrated with wiping away eraser shavings from earlier pages, and also wanted to finish out the comic with traditional inking (instead of moving to digital since I was so close to finishing). So the solution I decided on... was to do the rest of my sketches digitally, then print off each sketch on 2 8.5"x11" sheets of paper and use a light box to ink onto my 11"x17" comic paper. This obviously required a lot more effort and materials, but it was kind of perfect in a way, as I could add as much detail as I wanted into the sketch, but absolutely 0 erasing was needed.
Would I recommend this method? Probably not. But it did work all of my art friends that I was talking to at the time though thought I was crazy.