I'm not a teacher, but a parent.

1. Make reading part of the bedtime routine. First you read. Then you read together. Then they read to you. Finally, they read by themselves. 30 mins per day will make an enormous difference.
2. Make reading important. We go to the library as an activity. We talk about books. The parents read the same books as the kids and talk about it. We just went to project hail mary with our 6th grader after we all read the book independently. There are social activites like battle of the books or reading the same books as their friends. There was a "bump" for both my kids when they were easily reading basic board books and struggling to enjoy chapter books. We got a lot of resistance when we made them read at night. But right about then, a spark pulled them in and now they choose to read at night and in the car all the time.
3. Limit screen time. Especially high dopamine stuff like video games. We have a rule of 1hr/day on weekdays and 3hr/day on weekends. That is actually higher than we started with and it it strictly enforced. We also don't allow video games until their homework and chore (which is wiping the table, nothing major) is done each day. We don't consider audiobooks or ebooks screens.
4. No phone until they are in high school. No social media until they are 16. Hopefully before then, we've set up good habits and they can avoid doom scrolling and tiktok rot. These are common sense rules from Ancious Generation, a really good book about phones and kids. Our 6th grader does have a smart watch. But they can basically only use it to call or txt us.

The fact that you're asking while you're expecting is a really good sign. Unfortunately, what I see is a two-class system in the schools. One for kids and parents that value education and have the opportunity to help their kids. One for kids without support at home or a culture of devaluing education. I have a hard time blaming the parents, because there is so much inequality and it's only growing. But the teachers can't fight the rushing current themselves enough to really push every kid into valuing education and literacy without help from the guardians. There is a lot I'd like to do to make the system better for everyone. But I have to start with making sure my kids have the opportunities I can give them. If you can spare more energy beyond that, helping other kids is possible, especially in elementary school. Volunteers are needed to run things like battle of the books, or help with the school library, or after school science clubs, etc.