Skill Increases

At 3rd level and every 2 levels thereafter, you gain a skill
increase. You can use this increase either to increase your
proficiency rank to trained in one skill you’re untrained
in, or to increase your proficiency rank in one skill in
which you’re already trained to expert.

At 7th level, you can use skill increases to increase
your proficiency rank to master in a skill in which you’re
already an expert, and at 15th level, you can use them to
increase your proficiency rank to legendary in a skill in
which you’re already a master.