I just heard about a segulah for all inyanim by learning a sefer called Zera Shimshon, the author Reb Shimshon Chaim Nachmani who passed away without children promises in the introduction that anyone who learns from this all good etc.., (he lists alot specific things) and many have seen yeshous just by learning from this sefer including having children after many years, shidduchim,refuos, ( i recently started learning this sefer, very enjoyable)
Yes, you already posted a topic on it with a different username.