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If you have had trouble getting talks accepted at conferences, this is a good "behind the scenes" look at how talks are selected at PyCon US from @brass75: https://brassnet.biz/blog/picking-talks-for-pycon-us.html
I will say that serving on a program committee *one time* was actually really valuable for understanding what makes a good proposal.
@brass75 This has been a more general phenomenon for me as well. First time on the manager side doing the hiring had me realizing how much I stumbled into getting my own job. First time making a project budget, doing performance review calibrations as a manager, all of it gives you a ton of insight about how to engage with these processes.