Server suddenly started to crash when it's started

Hello. My problem, as the title says, is that my server suddenly started to crash every time I try to start it. My friends and I were playing quite often on the server and about 3 weeks ago one of them with the server access to start it said that the server was taking forever to start and then crashing every time and not even starting. Even though everything was working absolutely perfectly the very previous day. Even I tried starting and it didn't work. This has been happening for 3 weeks now, I tried searching other threads and followed whatever suggestion I found in the discussions of those threads, but none worked. I checked the logs (https://mclo.gs/RR4vOTn) and every time it said this:

[11:38:12] [Worker-Main-4/FATAL] [net.minecraftforge.common.ForgeMod/]: Preparing crash report with UUID 31ee59a2-e560-4bc5-b735-3e81bb18e5af
[11:47:09] [Aternos System/ERROR] [LOG]: Server was stopped because it took too long to start. Try reducing the load to avoid this in the future.
The server's software is Mohist 1.16.5 with 6 lightweight mods (ok one of them is slightly less lightweight, but it's still not that heavy) and only 2 plugins, which are the clearlagg and skinsrestorer plugins. The mods I'm using in this server are:
https://www.curseforge.com/minecraft/mc-mods/demonslayer
https://www.curseforge.com/min…on-demon-slayer-animation
https://www.curseforge.com/minecraft/mc-mods/obfuscate
https://www.curseforge.com/min…s/cosmetic-armor-reworked
https://www.curseforge.com/minecraft/mc-mods/wall-jump
https://www.curseforge.com/minecraft/mc-mods/wings
My friends and I just can't figure out what in the name of Rengoku happened to our server. It's really frustrating since we were enjoying a lot. Btw, I tried making new worlds and even deleting and remaking the entire server as well, but still didn't work... The image attached shows the point where it usually stops (some biomes there are added by the demon slayer mod) going any further and about 20-25 minutes after reaching this point it stops, and it shows that the server has crashed.

Quote from Roman

Try removing KimetsunoYaiba_1.16.5_ver38.2

That's the biggest issue. It's the main mod of my server and everything in the server is based around it. Although I did try removing it just to make sure, and it still didn't start...

Turning the software into Forge worked! Thanks for the help. I also wanted to know that can I now turn it back into Mohist to add the 2 plugins or do I keep it in forge? One of the plugin is a huge lag saver so I wanted to make sure if doing it affect it any more or not