What cartridge are you using?
A poor cartridge/tonearm can add to your problems. A high mass arm and high compliance cartridge can put the resonant frequency of the cartridge and arm exactly in the range of the nearby footfalls, which are typically at 7 Hz or below.
The solution is to use a less compliant cartridge. Typically, high output moving coils have lower compliance than moving magnets, so a cartridge like the Dynavector 10X5, Ortofon X5-MC, or Denon DL-160 would help your situation. (I'm not sure of the Denon's compliance at 7-12 HZ, which is the area of interest for footfalls).
Another suggestion is to brace your stand against the wall. I used a couple pieces of closed foam cell wedged between the wall and the stand. The point is to put some of the weight of the stand against the wall, which is presumably not subject to the footfalls.
I had a TD125 with RB300 and changing cartridge to Ortofon X5-MC and bracing the stand made the problem tolerable. A remodeling project to remove the carpet and replace with wood floors eliminated the problem completely.
You can also try stuffing cotton balls in the turntable springs to see if that might help.
Good luck!