After Liu Bei won the four counties of Jingzhou, why didn't he take advantage of the victory to capture Fancheng and Xiangyang, both in Jingzhou?

After Liu Bei won the four counties of Jingzhou, why didn't he take advantage of the victory to capture Fancheng and Xiangyang, both in Jingzhou?
The Battle of Xiangfan is an important turning point in the situation of the three Kingdoms.

Liu Bei's strength is limited

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Liu Bei needs time to digest his territory

Liu Bei lacks strategic depth

worry about being attacked