https://shulchanaruchharav.com/rosh-chodesh-in-midrash-and-chassidus-part-1/

How is Rosh Chodesh similar to Rosh Hashanah? What Divine light is received on Rosh Chodesh versus a regular weekday? Do we receive an extra soul on Rosh Chodesh; Does Gehinnom go on break on Rosh Chodesh just like on Shabbos?