1. Questing - Completing quests is a great way to earn Gil. Many FFXIV Gil quests offer a monetary reward upon completion, and some even offer additional rewards such as gear or items that can be sold for Gil.

2. Gathering and Crafting - Gathering materials and crafting items can also be a lucrative way to earn Gil. Many crafted items can be sold for a high price on the market board, especially if they are in high demand.

3. Dungeon Runs - Running dungeons and trials can also yield Gil rewards. Not only do bosses often drop valuable items that can be sold for Gil, but you also receive a monetary reward for completing the instance.

4. Market Board - Finally, buying and selling items on the market board can be a great way to earn Gil. By keeping an eye on market trends and purchasing items when they are cheap, you can turn a profit by selling them at a higher price later on.

While it may be disappointing that MGP cannot be directly exchanged for Gil, there are still plenty of ways to earn the game's primary currency. By questing, gathering and crafting, running dungeons, and utilizing the market board, you can accumulate a significant amount of Gil over time.

In conclusion, while it may not be possible to exchange MGP for Gil in Final Fantasy XIV, there are still plenty of options available for earning the game's primary currency. By utilizing the various methods outlined above, you can accumulate a healthy amount of Gil and Final Fantasy XIV Gil continue to enjoy all that the game has to offer.