There is nothing that you can do except get used to the idea that you are not going to Columbia.
The harsh reality is that there is almost no chance that you will get off the waitlist. Columbia is cagey about their numbers, but it is almost certain that there are at least many hundreds, probably thousands on that waitlist, and also very unlikely that they will take more than a couple of dozen people off the waitlist. If it happens to be you, consider it a lightening strike or winning the lottery.
There is a waitlist thread you can join to commiserate with fellow travelers:
2026 Columbia Waitlist Thread - #35 by dp17