Serialized on Narou

It's a light novel (currently being adapted into a comic), but I also recommend 'The Reincarnated Young Lady Won't Give Up' and 'Dahlia the Magic Item Seller Doesn't Look Away'!! Both feature protagonists with memories of their past lives in an isekai reincarnation setting. Both start from a disadvantageous position but move towards a positive outcome. Both are still ongoing on Narou.