Go for optics if you want to invade someone early. Settle at least one city in the southwest (I would settle two in that area, even though it will upset attila, but I like many cities), crank out some units (I like chariot archers for siege towers personally) before it's time to build Petra, train your units against barbarians and maybe that city state, and then go looking to pick a fight. After Petra, you should get national college and a legit army and navy before considering more wonders. Find more city states to demand tribute of to help with gold.
If you're not going to invade early then build libraries everywhere and beeline national college, then get the oracle if you really want it since it is pretty good, then get optics, then civil service or metal casting.
Either way, be ready for Attila, he will have an army by now.
I notice you're building a cargo ship in Assur but I don't see a good destination for it. With liberty, you will not have the gold from monarchy so your early trade routes need to be making you money. I would build settlers or units (trireme and chariot archer) instead. Triremes will help you protect your trade boats, and find you new trading partners.
You will also want at least one more worker, might as well get it soon.
It's a shame there are so few luxuries and horses (for circuses) on this continent, but I would put at least seven cities on it eventually.
There is some good land there, lots of hammers for lots of units. However, leaving quality spots open on your continent may entice others to settle there, which would be easy capture (free tech) for you.
One thing to note about liberty is that your borders will grow much more slowly than tradition, so you usually want to settle cities as close to the tiles you want to work as possible. That natural wonder will not be cheap to acquire, either in culture or in gold. Like I implied earlier I personally think there is enough good dirt to support two smaller cities there, which will benefit more from liberty policies (+1
per city, +1
per city, +1
per connected city). But, many liberty players prefer to go only with four cities before conquering to leave enough room happiness-wise for conquered cities - to each their own.