You may raise the level of the clan. You will need the following:
Clan Level 1: 35,000 SP plus 650,000 adena
Clan Level 2: 150,000 SP plus 2,500,000 adena
Clan Level 3: 500,000 SP plus Proof of Blood
Clan Level 4: 1,400,000 SP plus Proof of Alliance
Clan Level 5: 3,500,000 SP plus Proof of Aspiration
You may obtain the Proof of Blood by hunting the bloody queen in Dragon Valley.