Hmm, nothing to hide huh? I would be damned if we are to find out that you have some crazy stalk of sats hidden up somewhere 😁😁. But truth be told, using lots of address to mix the coins is more preferable although the fee is what will make it difficult but if like you said, the coins you want to mix is plenty then sacrificing the fee for the anonymity of your privacy is more preferable.
Ah, everyone has their sats hiding behind a wallet but they won't tell anyone.
Yes, more addresses is preferable when someone is going to mix huge volume of Bitcoin let's say if someone is going to mix $5000 worth of Bitcoin or more then I would prefer that person to use multiple receiving addresses. But, if someone is going to mix just $200 then it's much better to use a single receiving address to reduce the fees that you need to pay with multiple receiving addresses.
Where can i join for signature campaign?
You'll need to go to marketplace to apply for signature campaigns that are open. If you are saying that how you can join Thormixer campaign then unfortunately you can't join it at the moment because their campaign is currently closed for new participants.
Privacy has no "fees," if for you it is better to spend "more on fees" for $5000/BTC than $200/BTC, It is not a good idea, in fact, It depends on which mixer you used., since the algorithms used determine the best bitcoin mixer, so for many the priority is as the mixer algorithm work, and then the rate.
Consequently, the rate is regulated or competes with other mixers, for that element (
mixer algorithm ) not because it is cheaper.
Seven quotes from the guy/user who got lost in the mixer (this thread), of those seven, five quoted him to say the same thing, I don't think that mix of replies was necessary. 
Report to moderator, it works, right?