Pretty self explanatory.
Create the largest possible (European preferably) Kingdom out of personal and political unions.
Create the largest possible (European preferably) Kingdom out of personal and political unions.
Does it have to be a Kingdom?
Does it have to be a Kingdom?
In any case, a stronger HRE which inherits Sicily, subjugates the Pope, manages to force Venice to toe the line and utilises the extension of the Teutonic and Livonian orders as being part of the HRE to spread control over Poland-Lithuania might do the trick.
You could throw in the Low Countries as well since IIRC a large section of it was part of the Holy Roman Empire at one point or another.
Largest possible...for how long?
As in, does it have to be capable of enduring to the present? Or can it be something that lasts only a generation or two before receding (not necessarily collapsing, but receding)?

So, A Holy Roman Empire comprising all of Italy, Grossdeutchland, and Poland-Lithuania?
Can it get bigger?