Steering wheel/Seat Still Shake/Vibrate?

Maybe just intermittant misfire....or, if it does only while braking, the rotors might be junk.

Bad CV joint, likely.

Tires an or rims can be out of round. I’d have that checked next.

if you have any wear in track rod ends ..and worn anti roll bar rubbers the wheels only slightly out of balance will be emphasized

Then get the REAR tires balanced too.

All kinds of things can cause vibration in the car. Tire balance is the simplest to correct. A machine tells them what to do. Next are U-joints in the drive axles in a rear wheel drive car. Front wheel drive cars can have CVT joints failing. Transmission problems can also show up as vibration.

So go back to that mechanic and they work on it for free now, because they took money and the problem wasnt resolved

So you need to check a few other things such as alignment and drive shafts.

Probably your exhaust pipe

Assuming it only happens when you're moving, it could be a problem with your drive shaft which definitely needs attention.