Thumping noises/ vibration at certain RPM

If I let go of the pedal or accelerating even further, it stops. It happens maybe 30% of the time.i can feel it in the floorboards and I DO have bad motor mounts but why is this sound happening all of a sudden? As if something is hitting something. Here’s the video, https://youtu.be/oDb7l0dzIjQ it intensifies at the end.

amanti kia

Specifics
What is the vehicle’s model-year?
:evergreen_tree::slightly_smiling_face::evergreen_tree:
CSA

2004 Kia amanti

You now have 4 threads about this possibly worn out vehicle . Maybe you should just put it in a shop and find out just how much it is going to take to put this on the road in a decent running fashion.