Help Figuring Out the Cause of Low TPS in Fabric Modded Server

Spark profile: https://spark.lucko.me/nbEyPBInLH

Tried reading the tick loop guide but I can't get my head around the decrease in tps when more players join. Looking for someone who could read the spark profile and help me figure out what I'm doing wrong with my server.
spark is a performance profiler for Minecraft clients, servers, and proxies.
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