With the introduction of your Custom Origin rules along with the up to date version on the Firbolg published in Monsters with the Multiverse, the Firbolg’s abnormal combination of ability rating increases isn't any longer a problem, and instead they’re still left to face on their other racial traits

The professional soldier who’s found a lot of battles. The gate guard who lost his home city and picked up a sword. The watchman who acquired caught up in anything larger than themselves. The hunter who chanced on one thing aged and historic. Most of these and much more is usually fighters. Iron Fis