You may want to consider keeping some of the grade for water runoff. Could you just put in 6x6 pressure treated post, but put them about 6’ under ground and cement them in. Then do 3or 4 rows of 6x6 in between the posts anchored to the posts with some sort of Simpson hardware, then fence above that. Could even reduce the spacing between posts to 6’ or so to strengthen everything up a bit. Then just put in the weeping tile and some gravel, then haul in some topsoil to build it up.
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