I presume that your keyboard sounds have a higher pitch and therefore isnt suppressed. I can`t remove stuff like that either with noise removal. I use noise removal to get away the constant humming and hissing sounds. At this point you can either play around with the levels for how much background noise you remove but that might affect your voice, you can specifically select the keyboard noise in Audacity and try removing that, you can shield your microphone from the keyboard, play with your audio recording levels, you can get a more quiet keyboard, you can "drown" the sounds by adding music/ambiance but you run the risk of drowning your voice also, OR do a voice over. For the kinds of videos I make, I have to do voice overs, but I still have to do noise removal. So I lock the door, remove as much background noise as I can, shield my microphone and record. Then all that is left is humming/hissing which audacity decently removes. I get a good result without spending the extra $$$ for more pro equipment. Hope this helps.