Based on your image I see a few things. You are over extruding some. Back your flow rate down to 98 or so. PETG likes to be slightly under extruded.
The artifact you see to the right of the Y is called ringing and it usually means your movements are too fast for the mechanics of the machine. Since you are printing at 30 mm/s it is most likely the acceleration for the axis is too high. Drop it by half in the config.txt file.
Another issue I see and is probably the most serious is it appears you have some wobble in the Z axis. Either the Z screw is bent or the guides are bent or the glass is moving in the platform. The easiest way to see is open the manual controls and move the Z to the bottom then home it.
Watch the platform as it moves up and see if it moves back and forth at any time or in a straight line.. Then check the glass is secure and not moving. If the rods or screw show evidence of being bent or warped they will need to be replaced. Unless you want to try to correct the bend yourself which might make it worse.
Get the over extrusion fixed first. Those little blobs you have ever so often on the corners are caused by over extrusion and not layer shifting. That layer just squished out more than the one above and below it. Then print the same model again and we will take a look at it. Since it has those recessed letters you will need to double or triple your wall thickness from what it is now. That to may help to get rid of some of the issues.
Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
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