1.14.2 Map lagging (server overloaded)

I've been playing a world with about 6 people active on the map. All the sudden after 20 days of playing the map, it starting lagging whenever there are 3+ people on. It always shows that the server is overloaded (can't keep up). (if there are 4 people, it is about 7000ms behind, 5 people= 10200ms behind and so on). When there are more than 2 people, eating lags, bow shots also lag and placing/destroying blocks lag also. I /debug start for a few minutes, and here is the log.profile-results-2019-06-06_15.53.42.txt

"java -Xmx8192M -Xms7000M -jar spigot.jar nogui" is what I run the script on.