TPS Issues

I have been having huge sustained TPS drops and lag spikes on my server and I have not been able to figure out the issues. I have a spark report, but I can't narrow down the exact issue likely cause I just don't know how to read it effectively. I was hoping I could get some help. I am also interested in learning about anything else I am doing wrong not related to the main issue(s) to optimize the performance of my server.

https://spark.lucko.me/DlztJTbY95
spark is a performance profiler for Minecraft clients, servers, and proxies.
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