I decided I am gonna give this a go. My original POD (there will be many of them), is Cato dying before he goes on his trip to Carthage, and Nasica Corculum (his opponent who always said Carthage must be preserved), wins out, and Carthage is not destroyed, thus keeping Rome's moral foundation. This is what I got so far. I am not too familiar with very specific events in this timeline outside of the roman politica ones and the triumvirate, so help would be very appreciated.
In 153 BC (the year in OTL where Cato went to Carthage and forever afterward always uttered the words Carthago delenda est), Cato dies peacefully of old age.
153 BC: Following a complaint by Carthage on Massinissa's further encroachments across their borders, a delegation lead by the pro Carthaginian and former Cato opponent, Publius Cornelius Scipio Nasica Corculum, is sent to investigate the case. Corculum, a believer that Carthage should be preserved or Rome would lose its moral values and discipline. He returns with the news that nothing unusual is happening, and Carthage's claims are unfounded, and Massinissa is granted the territory he demands.
152: The senate supports Alexander Balas' claim to Syria.
151 BC: Massinissa again encroaches with more demands. Again Carthage complains to Rome. Corculum convinces the senate that the territory Massinissa is encroaching on now was always Carthaginian. This is a stunning reversal in Roman policy with arbitrating between Carthage and Numidia. Massinissa bitterly withdraws.
151 BC: The indemnity from Carthage to Rome is fully paid off. The Senate shockingly does nothing to extend the indemnity. Instead, they up the grain, ships, men, and supplies that Carthage has to send to Rome for wars. The Carthaginians adhere to this without protest.
149 BC: A pretender arrises in Makedon. Andriscus calls himself Phillip, and falsely claims to be the grandson of Phillip V, and son of Perseus, the last King of Macedon, who died in the third makedonian war. This sparks the 4th makedonian war.
149 BC: He was able to enter the Macedonian republics without serious resistance, defeating the local militias and re-uniting Macedon to a single state. He was successful enough in raising an army to defeat the first Roman force sent against him in 149 under the command of the praetor Publius Iuventius Thalna (who was killed). Thessaly was overrun by Andriscus' forces.