Recruit for team gaps: Add healing, range, mobility, or a front line first
For Cai's healing gap, start with Yang Jie. For Leda's melee gap, consider Guzran. Recruit core units early enough to develop them.
Original video: “Fire Emblem: Fortune's Weave — Recruitment recommendations across all four stories”; Bilibili creator Ken Cuozhao Zhong. Watch the original
If 
Cai needs healing, start with 
Yang Jie. If 
Leda needs melee damage, consider 
Guzran. Recruit core units early to leave development time.
Earlier recruitment gives more development room
Recruiting earlier leaves more room for personal development. Waiting for unrecruited units to gain levels automatically can leave weaker stats instead. Identify the missing job, then choose someone with suitable requirements. You do not need to invest in every difficult recruit.
Recruiting the same person on different routes lets merging retain the higher value for each stat, so separate routes can improve different weaknesses.
Cai's route: Healing and the front line
Let Yang Jie heal early so 
Tialla can develop offensively. For more damage, choose 
Nuzzuo or 
Sirocco. 
Loretta adds mobility, while 
Esmeralda provides a durable front line.
Dietrich's route: Ranged damage
Recommendations include 
Kiroc, 
Mu, Guzran, 
Catania, 
Peter, and 
Sofia. Kiroc is one clear choice for additional ranged attacks.
Leda's route: Mobility and filling gaps
Catania has accessible recruitment requirements and high mobility, making her a priority. Choose Guzran for melee damage, Kiroc for ranged damage, and Esmeralda for a durable front line.