To add, the limitation of active torrents shown in the Profile is in force only when you initially seed an own new torrent. At any other time, there is no limitation in the number of seeding torrents imposed by the rules or system.
Remark: It is easier to increase the number at early account times, because it is based on the highest all time average. Best by uploading own torrents.
If we see high upload rates, we can give an exception to our "Only one new torrent" at a time rule. 1 for each 75 KBytes/s upload rate, usually we give only up-to 3 new.
The number of simultaneously allowed downloading torrents is shown in the Downloading rules of our "Rules" page, accessible from the blue menu band.