The Little Things Between Me and the Goddess

Urban Fantasy: Customizable Growth Skills With No Level Cap

I want a book like "You Didn't Even Join the National Fortune Challenge, So Where Are You Hiding?" A modern urban fantasy side story: the protagonist travels physically to another world, and has customisable growth skills with no level cap, permanently increasing various attributes [Hell's Curse, Soul-Devouring Strike, Soul Domination, Soul Refining...