This creates a simple mod that edits DT_BaseCampLevelData.uasset which contains the max workers and max bases per player/guild.

Instructions:

BaseCamp Level 1
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BaseCamp Level 2
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BaseCamp Level 3
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BaseCamp Level 4
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BaseCamp Level 5
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BaseCamp Level 6
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BaseCamp Level 7
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BaseCamp Level 8
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BaseCamp Level 9
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BaseCamp Level 10
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BaseCamp Level 11
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BaseCamp Level 12
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BaseCamp Level 13
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BaseCamp Level 14
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BaseCamp Level 15
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BaseCamp Level 16
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BaseCamp Level 17
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BaseCamp Level 18
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BaseCamp Level 19
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BaseCamp Level 20
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BaseCamp Level 21
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BaseCamp Level 22
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BaseCamp Level 23
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BaseCamp Level 24
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BaseCamp Level 25
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