Dont worry about adding more neatsfoot, if you've already put some on you dont want to overdo it. Just give the strop a good rub with your hands to soften the leather.

The other option is to lay the strop flat and roll a wine bottle over it a few times to soften things up a bit. You'll also find that the strop naturally softens on its own as you use it.

My preferred option for softening strops is to just use the natural oils from your skin, so every time I go into the bathroom I give the strop a rub all over with my hands. The combination of the oil from your skin plus the rubbing really softens the leather up and increases the draw.

If you want to, you can even rub your hands on your forehead or something, then rub the strop to get more oil in. It sounds gross, but it really works very well..!

If that still doesnt have things where you want them, then add a little more neatsfoot oil. You can always add more, but you cant take it off..!

Good luck!