My dear friend what do you want me to do, elongate the fanfic or want me to make it a fast forward one.
If you want me to fast forward i will make him very strong in next 15 chapters but if you want to maintain the normal pace then i will resume like this.
list all of the harem members you want to add in future. I will change his course of action according to the harem members after some chapters.
but don't worry the main theme will be always the adventure, action and harem.