There was an article in the August 2021 issue of Southwestern Musician (the TMEA magazine) titled "Rebuilding a Small School Music Program" linked below. The article begins on page 20. When you have 5-10 minutes, glance through it. There are some good tips in there.
If you are talking about outside of the school, be careful using the "R" word. I don't "recruit". I let our results and the quality of the program speak for themselves. If people want to be a part of this program, I'd love to have them. We don't offer scholarships for band (it isn't allowed anyway). There is financial assistance for attending the school where I teach, but it is needs based and has nothing to do with the courses a student selects.