There are few things that I would like to suggest:

Suggestion 1:
Due to fact that mayority of paid users will probably start to follow up to 10 traders immediately:

Very quickly the users will find it difficult to keep a track with a lot of notifications that might start to get for a single bot channel.

We should look for now to implement, another passive notification bot, and for users to decide either via GUI or via bot command menu which traders they wish to actively follow under main bot, while other bot channel(secondary bot) will provide them the rest of notificaitons from other traders which are not of highly interest to them atm, but they will still like to keep track of what they're doing.

Suggestions 2:

Followed traders summary:

Quick bot command that user can send to notification bot at any time, that can give user a general summary of current PnL of all traders which have open positions and they're following them atm.

This command can be executed 4 times in an hour, and we should send automated summary at certain time once in a day.