Massilia should watch for sea-borne diplomat attacks from Romans; try to make peace with them to avoid that and to let your trireme take your caravan to a good place; then try to colonize on rivers north and west.
Taras should fortify a phalanx next to Heraclea then send a settler to build on the 3-special hill south of there
Syracuse should maintain peace with Carthaginians and try to colonize south-east Malta and the cape-with-whale south of Malta
Delphi should try to buy Athens and to colonize on both sides of the Adriatic.
Rhodes may be able to buy Miletus with a sea-borne diplomat, establishing a strong eastern chain before the Seleucids are close enough to retaliate successfully
Pergamum should colonize on the island to the west and at Istanbul.