AHC:Greatest Possible Bulgaria

With a POD after 1886, what is the greatest possible, in power and territorty, Bulgaria, with the monarchy intact?
 
Having Bulgaria win some more territories in both Balkan Wars would help, as well as either staying neutral during WWI or joining the Entente.

Alternatively, you can still have Bulgaria keep territory while it's a part of the Central Powers, and the only requirement for that is for Ferdinand to not surrender and abdicate. If Bulgaria actually fought back in a defensive war against the Allied offensive coming from Greece or Macedonia, then chances are that the Allies might suffer more casualties. Bulgaria's military had two best leaders: Nikola Zhekov and Vladimir Vazov, and the latter was even invited to Great Britain at one point.
 
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