Eren was just three units away from entering the upper stage of the F-Rank.
Of course, he knew that the path of a ranker wasn't so linear. There existed bottlenecks and lack of experiences in one's field, preventing most rankers from quickly progressing further in their ranking journeys.
So what he considered to be merely three units of difference in BTP value might turn out to be a huge mountain to scale for him. But he wasn't discouraged by that realization.
After all, this was Eren's personal best in ranking progression in terms of speed. He would have never thought that he would be able to get this close to the upper stage of the Novice rank this early in this timeline.
Eren figured that his current hard work or past timeline's experiences weren't the only reasons for his surprising progress. He could feel that the transformation he had been through by fusing with Reen also had a hand to play in it.
'The pursuit of power doesn't need a rhyme or reason.'
Your gift is the motivation for my creation. Give me more motivation!