Hello again my Minecraft world (the b smp ) has bugged out saying there is a problem loading this world

Please Minecraft can u fix it I have worked on that world for 3 months with my friends
The only thing I can think of was how many people have joined(18)
I hope I can get it back I can even get rid of 8 so I can play it again.
Also this my second time sending a bug ‘ complaint.
I really really hope you can get it back.
I can even wait for the next update.