Death March kara Hajimaru Isekai Kyousoukyoku, Tensei shitara Slime Datta Ken Recommendations
Both series feature mid-30's salarymen being reborn in a JRPG-based fantasy world. The MC is gifted with extraordinarily OP cheat skills right off the bat and wields god-like abilities (much to the dismay of the supporting cast). The MC gains a large, ever-increasing number of devout followers (or a straight up harem). The opposition, if any, is easily defeated or subdued while the MC grows more and more powerful.
Both male lead isekai or teleport in another world
Both male lead has overpowered
Both has harem spice
Both has sinilar setting where mc life in oldest time
Both protagonists are selecting many useful skills for a following adventure. But I would prefer this anime, because here isn't a harem and it goes on more logical.