Hii this is all isekai + adventure + slow life
https://www.mangago.zone/read-manga/kamitachi_ni_hirowareta_otoko/
https://www.mangago.zone/read-manga/yasashii_kazoku_to_takusan_no_mofumofu_ni_kakomarete/
https://www.mangago.zone/read-manga/heart_warming_meals_with_mother_fenrir/
https://www.mangago.zone/read-manga/sozoshu_nano_de_motto_yasashikute_kudasai/
https://www.mangago.zone/read-manga/reincarnated_as_an_aristocrat_with_an_appraisal_skill/
https://www.mangago.zone/read-manga/maseki_gurume_mamono_no_chikara_o_tabeta_ore_wa_saikyou/
https://www.mangago.zone/read-manga/hiraheishi_wa_kako_wo_yumemiru/
Not everything has many chapters but having a lot of options helps :)
Also I just want to recommend this one, MC is not a little boy but it's just so funny and light hearted (genre adventure)
https://www.mangago.zone/read-manga/dungeon_meshi/
So basically what I’m looking for is a little boy going on adventures it Hass to be cute and fluffy and soft not thriller and hard-core stuff it Hass to be really Soft and it Hass to be long