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An RC column has 4 important variables to design for a given load, look below for the list:
1. Height of column
2. Strength of concrete grade used
3. Reinforcement bars
4. Column cross sectional dimensions
So, to answer to your question, without increasing reinforcement for a given height, column dimensions would be to increase concrete grade. Many cases this may be workable but you may end-up increasing column cross sectional dimensions as well.