Okay, so 'Jobless Reincarnation' really sets a high bar with its world-building and character progression. I'd say the first that comes to mind is 'Mushoku Tensei: Jobless Reincarnation' itself, but since you're looking for similar vibes, 'Ascendance of a Bookworm' is a fantastic pick. It's got that deeply detailed, almost anthropological approach to fantasy world-building, where the protagonist's modern knowledge reshapes everything. The magic system feels earned and integral, not just flashy.
If you're more into the 'second chance at life' and power progression, 'So I'm a Spider, So What?' hits that note, though the tone is lighter and more chaotic. For the darker, more morally complex fantasy politics, 'Re:Zero' is brutal but brilliant in its character study. Honestly, after 'Jobless', most other isekai feel a bit shallow, but these ones manage to carve out their own unique space.