After 3 days of mind scratching, agony, pain and frustration searching for answerers day after day with absolutely no hope at all!
I have been using so many options like cubical.xyz to only have my litematic change all the concrete blocks to stone even changing the wood logs to stone... It was an absolute nightmare and I was not about to change all the blocks back to it's original state as it will take forever. Not to mention all the old Videos on "How to change a litmatic to a Schematic" that JUST DOES NOT WORK anymore for newer Minecraft versions and just seeing video after video of "How to make a Schematic to litmatic". 
O then again you can go into it much deeper with configurations and add the word you want into your server just to use world edit for the piece of the building you actually want. But if you are like me, you don't have any experience in configurations so you are basically forced to watch a lot of videos on "how to do this and that" after the 4 or 5th video you're like just OVER IT... you give up. All this you are reading is just pain in my belly and it is not the bad food.
I finally had an idea and I just had to post it for you guys out there in the world suffocating as I did. The fastest way I found how to change a Litmatica to a Schematic follow these steps and you will most likely sign of joy links will be down below. First of all, let's get the truth out there just stop trying to make a litmatic of your building, just stop. No matter what you try to convert that file to a schematic it won't work, here is what I suggest.
1. Make a temp server. Go to aternos.org, They have a lot of short tutorials on how to start your free server it is pretty simple and explanatory for even a 5-year-old. (Keep in mind this is for a plugin server) so set it up as paper or Bukkit any of your choices
2. Add world edit as a plugin and the version you want it on for your playing needs so that it is compatible with you're temp server.
3. Start your server and go into it.
4. Load up your Litmatica (Note that you will need the following mods for Litmaticas to work links will be down below)
5. Then take out your Litmatica tool if you haven't changed it, it should be a stick and crtl and role the mouse button till you see the following (Paste Schematic in the world) Do not stress about it not saying litmatica it is just how the mod works remember it is not a scheme yet still a Limatic file.
6.Now for me its "k" you will have to go into your lithmatic settings Hotkeys>executeOperation. after you know what your key is just press it and it will load up the Lithmatic as a build. Be careful for too big lihmatics it can make you crash.
7. Now you can use world edit to make a schem of your building instead of a litmatic. I will post the link down below if you are not sure how to make a schem with world edit.
8. Once you have saved and made your schem close the server, and go to your plugins file and look for world edit click on it and inside the world edit plugin file you will find your schem file.
9. Congrats you now have a schematic file of your building. you can copy and past it into the server you actually want or I do not know what else you wanna do with it.
I know I know, it is not completely changing a lithmatic to a scematic but it's a solution to work around it to get a schematic file of your building. Comment down below if this worked for you or not and if I should make a video on this for you guys, don't be nasty in the comments.You can also follow me on social midia.
Do take the time to watch the short video I made just to show how easy it is to change the files now :)
Links:
World downloader: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/2520465-world-downloader-mod-create-backups-of-your-builds
Aternos: https://aternos.org/
How to make a schematic with World edit: https://apexminecrafthosting.com/how-to-load-a-schematic/
Twitter: https://twitter.com/AnnaAnnebell
Twitch: twitch.tv/annumannu67
Youtube: https://www.youtube.com/channel/UCyi250_-t61jkVN4VdSQxVA
Links to Litematica mods that are required:
Litematica: https://www.curseforge.com/minecraft/mc-mods/litematica/files
Fabric API: https://www.curseforge.com/minecraft/mc-mods/fabric-api
MaLiLib: https://www.curseforge.com/minecraft/mc-mods/malilib/files
