Until there are literally 0 unwanted pregnancies in the entire world (100% of the population has affordable access to contraceptives, and those contraceptives are 100% effective 100% of the time, sexual assault never happens, and contraceptive sabotage never occurs), and until pregnancy is 100% safe and never presents medical risks or complications, and until pre and post-natal care is 100% affordable for 100% of the population: legal abortion will be needed.
Never forget that. Abortion is a medical procedure that serves a wide variety of situations and may be needed for a wide variety of reasons. And until only people who want to be pregnant get pregnant, and only when all pregnancies are safe and affordable, and all pregnancies are carried safely to term, until that somehow happens, people will need abortion.
If you want to reduce abortions numbers (and really, we ALL do) then we need to address the factors that make abortion needed.