Server won't start after removing mods

Hello! Hope you are doing good because i'm not!
So I started this server in early 2O22, it was a server to play with friends and make contries, we added mods with the time, and we got more than 1000hours of playing in the server, yersterday, we added some new mods again to make our experience way cooler, and we started the server as usual, and tried to join the server, but then the server freez and crash, i saw in the consol that it was beceause of the mods and that the server don't have more RAM space, so we decided to remove some mods that we don't use so the server can run with more RAM space without crashing, but this time the server was starting for ever and was stuck in a ligne that say [.....13 more], so we thought it was normal and it would take time, the server was starting for over a 1HOUR, and then i decided to create another server in aternos and add all the mods, and this time without our map, the server started easly, but when I added our map, the same problem, the server start and stay stuck in the ligne that say [.....13 more], so we figure it out that it was the map, so we tried to fix it with our Minecraft launcheur by importing it, but when i try to enter it said an error, and i have the option to click on SAFE MODE, but it do nothing, i tried multiple things but looks like our map have a problem and that we can't play on it another time, its very sad for us because they are really a lot of buildings that we build i mean CONTRIES, we built a lot of cities and contries, its a lot of work, and we can't just restart from 0 again, pls Aternos suport help us, we really want to play in that map again .