What major problems was Augustus Caesar facing when he became Rome's princep (1st citizen/emperor)

Augustus faced several challenges as emperor. First of all, he could not call himself “emperor”. This is because the Romans hated autocratic rulers, because of a few things that happened during the late Roman Kingdom. So if he styled himself as a monarch, it probably would not go down so well with the Romans, especially the rich and powerful Patrician families, and his political enemies would exploit this to gain power and popularity. So Augustus had to make it look like the Senate had all the power when in reality he was the one pulling the strings. Moreover, years of civil wars had left the city of Rome in ruins. It had a failing economy, damaged infrastructure, problems like overpopulation, poverty and a lack of sanitation. Plus, due to the civil war, the Roman legions had been bloated up. When Augustus took power, there were around 60 legions in total. This placed an immense strain on the already deteriorating Roman economy. And plus, due to the Marian reforms, the legions had become loyal to the general rather than to the Senate, which is what allowed the civil wars to take place.