Confused on how many calories/macros

If I’m female 5’7” 155 lb I would like to lose 20 lb but I weight lift and the goal is also to put in lean muscle but I’m confusing my maintenance calories and how many calories I should be consuming since I’m
A mail carrier and walk 10 miles a day and burn over 3000 calories... does that mean my maintenance would go up? Should I be eating more? So confused

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