If you're pushing on fabric to get it to feed you are likely causing improper feed which will move the needle out of place and strike race or top plate.
You need to be careful to not push on the fabric while the needle is in contact with fabric. Try manual turn of wheel while foot needs to rise to top of fabric hump.
Try a
Jean-a-ma-jig or Hump-jumper
trying to sew over a bump of fabric, such as a thick jean hem, try using this tool
local fabric store should carry it
It keeps your pressure foot level as you sew over the
bump
you said your needle plate has many strike marks on it,,make sure you can't feel the strike marks so the fabric won't hang on them,,because marks on a needle plate can pulled the fabric
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