Final answer:
Roderigo plans to return to Venice due to a lack of honest work opportunities in Rome, diminishing wealth, and disenchantment with local corruption.
Step-by-step explanation:
Roderigo plans to return to Venice because he feels his prospects in Rome are dim. The given reference includes reasons like the lack of opportunities for honest work, the decrease in his wealth, and a general sense of not fitting in with the corrupt dealings in Rome.
Roderigo's decision to return to Venice, where he believes his fortunes may improve, is fueled by his disillusionment with his current situation and his hope for a better future in the city that was praised by Petrarch as an "another world."
In the passage, the speaker expresses dissatisfaction with Rome, stating that there is no place for honest pursuits and no profit to be gained through honest work. Roderigo wants to go to Venice and leave his native land behind, where he believes there are more possibilities for financial success.