If you know of pro-life legislation–especially at the local or state levels–that you support, contact the sponsoring organization(s) and offer to donate funds for local advertising. You can help them pay for TV, newspaper, or radio spots, billboards, or targeted social media ads. Or you can volunteer your time to help distribute flyers or drop cards. Similarly, you can use the same methods to advance arguments against impending pro-choice legislation.
If you aren’t in touch with pro-life organizations who can use your donations or time, remember you can opt to create (and, if necessary, purchase) advertising on your own or with a group of like-minded friends.