PlzHelpMe

I read previous forums and reddit posts about this issue, and still, couldn't find a solution. These days, my ping often gets up to 1500 or even more. Though some of my friends which are on the server doesn't seem to have the ping problem (they don't have it currently but they had the problem previously on the same server). I was told that the ping is high because of how many servers that are being hosted at once, and can be fixed (kinda) with upgrading your server plans. One of my friend owns a server with a MH20 plan, and is still having the same issue. Some affects of the high ping are: Unable to place or break blocks, unable to ride mobs (e.g horses and pigs), and will teleport you back to where you were 5 second before. I tried restarting the server multiple times and this problem is still going on, how can i fix this?

I fixed the problem, its alright now

I wanted to enable command blocks so when I press a button (or any redstone output/input), I wanted it to teleport me to somewhere, but it won't work. I enabled command blocks in the setting of my server, and it still wouldn't work. Any suggestions?