can anyone offer advice

tips tricks anything my son who's now 5 was the best surprise of my life but now I have been ttc for almost 3 years I also had a mc this passed nov.... I try stop trying try again etc I have 3 different app which "track" all are usually a day or so apart in ovulation give or take I've used preseed take prenatals I just dont know what else to do I've wanted another baby for so long my son wants a brother or sister he asks everyday and it kills me.