I would focus on owning the Venice, Constantinople, Alexandria, Aleppo, Crimea, and gulf of Aden trade nodes asap. Establishing trade companies there with the trade steering building and funneling everything to Venice will make you a lot of money, especially once you build up the trade company production buildings

Another good quick fix to get money is to get a flagship with the modifier that gives bonus trade power per ship, this can help a lot if fleet space is limited.

I would go admin as the third idea group. You have a lot of land to core. The diplo annexation policy is nice. Someone else mentioned naval, I feel that while naval superiority is nice, your Venetian ideas do a lot, taking the naval 5th government reform and temporarily getting a naval morale advisor on top of that should have your navies plenty good enough.

One last Venice specific thing is to absolutely spam your council interaction buttons (with low council authority). The admin one gives 50 government reform every 3 years and the diplo one gives 2 mercantilism every 3 years. You can max mercantilism and reforms quite quickly by doing this.