IMO your holly is set in its pot way-way too deep. Wait till after spring repotting before you chop off those half buried branches poking up alongside the trunk.
Your Holly is old enough to have a nice halo of well grown roots at where-ever its true soil-line is. You might want those low hanging branches as sacrifice branches inna year or three.
Measure (or draw) your bonsai twice, cut once.
Think like a tree
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