You need to give it a helping hand over the thick seams. There is a gadget called a jean-a-ma-jig which could help.
Or sew up to the seam, leave the needle in the thread, lift the pressure foot, then insert a thick piece of card from behind to make the foot level with the seam, lower the pressure foot then sew.
The idea is to make a level surface instead of a bump to sew over. Improvise any way you can.
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