Tensei Shitara Slime Datta Ken
absolutely delightful to read a great mc, sure there's a probably an issue of OP but i think compared to some of the other Isekai mangas this one is using that opness to do some really good things for larger groups...plus it has hilarious consequences!
Spirit Migration 01
super cute and has honestly a very promising story, the end is however weirdly abrupt which is apparently because the manga was axed or was only there to try and help promote the Light novel so don't be surprised by the disappointment of the ending of the manga, but also don't let that stop you from reading this awesome story and perhaps going on to read the novel which i assume continues with the awesomeness.
Botsuraku Youtei Nanode, Kajishokunin wo Mezasu
I have read a manga with the same premise but with a female mc, so i looked forward to seeing how this one went, while i has a similar main idea it is going about it rather differently and i am enjoying it def worth the read, mc is pretty fun and while some of the story elements are a little rushed or out of place in general its quite a nice read.
Isekai Kenkokuki
This starts out hard to read, i dunno if it's the pace or maybe just some iffy translation but if you like isekais that don't full on deal with fighting and are more about creating a life this is definitely one to add to your list, the mc is reincarnated randomly into a word that does seem to have traditional fantasy monsters and with a 'magic' system that is all about blessings from gods. it looks like it will be a nice read but you just have to get past the first few chapters to understand it better!
Sono mono. Nochi ni...
MC is....sort of rejected? his girl is kind of stolen away due to him being a useless ranking human in a fantasy world...this leads him to run away and inevitably train in a mountain, the plan was originally for him to just die in the mountain but due to the worlds goddess taking pity on him, he ends up with some blessings that while not entirely useful give him some interesting habits.
Isekai Tensei Soudouki
The MC is in a way dying but thanks to some extra help from 2 extra souls he lives and goes on to become...a creep? lol thanks to the extra souls he's a bit insane but also smart thanks to said souls, quite a good read and no matter what chapter you're up to it will be disappointing when you have to wait for a new one :P
Chihou Kishi Hans No Junan
This is a good go at trying a bit of a different isekai formulae, for one part the MC is sort of a npc who was once a great knight but now finds himself living the country life of the outskirts of his country due basically to self-retirement when all of a sudden Japanese peeps be falling into the world from every which way blessed with special op powers, ideas and some sort of status menu?
Saving 80,000 Gold Coins in the Different World for My Old Age