Problem/Bug Help with server Lag

I run a mc vanilla server, but sometimes for 10/20 seconds the server it goes down to 14 TPS, I would like to understand how to solve this problem.

My Plugins:
InventoryRollback, LuckPerms, HealthBar, Skript, TabList, Essentials, LoginSecurity, EssentialsChat, EssentialsGeoIP, ClearLag, PlugMan, SkQuery, PlotSquared, CustomRecipes, bAnnouncer, Multiverse-Core, ProtocolLib, SkinsRestorer, Orebfuscator4, DiscordSRV, Multiverse-Inventories, SexyMotd, LockedItems
(The underlined one are deactivated by Plugman )

My Specs:
CPU: i5-6600k
Ram: 16GB DDR4 2133
SSD: 120gb (where mc server is stored)
Connection: 200Mbit down 30Mbit up
SO: Windows server 2016

This machine is built only for server purpose, i play on a different machine

When the server lags the CPU it is at 15% maximum and the server he still has free 5GB of ram (it can use 8gb maximum)

Timings: #1 https://timings.spigotmc.org/?url=sagukupoto

 

Why do you need these plugins? LoginSecurity shouldn't be needed as the default online mode should be enough to verify that the player is who they say they are, and the player's skins should work for most versions.

If you remove all of your plugins, does the CPU usage go down significantly? If so, slow-ly reach the plugins until you figure out which one is causing a majority of the lag.