u/Leechseed20

Trying to trade up to a Gold Star Espeon 8.
I have a sequential 10 /Japanese stamp box set ( with box and stamps ).

Should I let go of it to put towards the Espeon?
Or try to trade other stuff instead? I really like my stamp box set and not sure if it’s hit its max value.

I understand it won’t be a straight trade but how much value on top should I expect to pay or trade extra?