Jesus fuck, if you want people to have kids, it is not that hard. Remove obstacles. On average, people want to have kids. It's an evolutionary drive. People override that drive when they do not feel secure enough to start a family. Just make that easier. That's it. Make sure people can afford to have kids, that they can provide them a comfortable and safe upbringing, that they can ready their kids to become adults, and that their kids' future seems likely to be bright. How?

Decrease inflation. Subsidize child care. Increase wages and benefits (raise the mimimum wage). Mandate maternity/paternity leave. Make coverage for kids on health, dental, and vision insurance less expensive, or provide medicare for all (or at least all children). Make sure young people can afford good homes off of minimum wage. Make sure good schools are available to everyone by improving public education and providing bussing. Make sure kids are safe in schools with gun control laws. Make sure college/trade schools are inexpensive and accessible. Stablize the economy. Promote good middle class jobs. Avoid war. Fight bigotry. Provide comprehensive sex education and family planning resources including abortion rights so that people can start families when they are ready and promote generational welfare rather than propogating generational poverty.

Notice how damn near all of these things that would increase the birth rate are antithetical to GOP policy though? You want the results, but not the means. You want to offer "medals" for motherhood like a boss offers a pizza party for a record profits last quarter. It's unserious, unhelpful, condescending, insulting, and still leaves new parents struggling to get by. Be better leaders with sensible policies. Maybe then you will get your wish.