Then the knife is highly unlikely to be a single bevel once you have thinned it that is the main body of the knife should gently taper down to the edge sharpen at 15˚ per side you should not feel any shoulders above the edge.
As I said before if you can stretch to it get an Aotoma 140 bench plate (also good for flattening stones) and then thin probable something like 5-7˚ per side I don’t expect you will have to do too much it should remove your polished bevel .
First of all I would put the blade edge virtually perpendicular to the plate to reshape the belly on the last third towards the tip , next lay the blade flat on the plate and raise it a few degrees run it across a couple of times tho see how far up the blade your getting I would say around one third up should do it do about five strokes and see what is happening that way you can keep it in check I would suggest turning it over every 5 passes just keep checking it that is the whole point with any sharpening be it freehand with the WE. Once you have thinned it virtually to the edge then you can put the 15˚ bevel per side with the WE the bevel should be narrow about a max of 1mm per side.
The thinning is like taking a bump out of the body which is why it will slowly work down towards the edge from about a third up .
I hope you can follow this try drawing it on paper first if you have difficulty picturing how it will work.
I would recommend that you try to do this knife it will make you grow as a sharpener a wonderful opportunity .