You'll need 250 gold to get the crown and like Zsrai said another province in Portugal. I'd go after that errant Braganza if I were you. But, well, it doesn't look too good for Christians in Iberia. And not even twenty years in. On the plus side Burgos is a vanilla CK crusading target so maybe you'll get some help, but do what you can to survive. You do only have one province in your demesne, which leaves you pretty vulnerable in case of a war.