I just saw this topic.
Personally I use exactly what Charles-Tim suggested above:
1. Whirlpool coinjoins, from Sparrow which has this feature enabled (if you want) for hot wallets. For details check Nathan's video here:
https://www.youtube.com/watch?v=HIHoNaQdzP0&ab_channel=theBTCcourse2. Jam, which is actually a UI for JoinMarket. Very easy to use. For details check Ben's video here:
https://www.youtube.com/watch?v=FbyjG2upGO8&ab_channel=BTCSessionsTechnically, I could send coins from sinbad campaign , right? Even if in the past those coins came from their address.
You could and you should, in my opinion! As I said in another thread, I would mix my UTXOs from this campaign (I wasn't part of it, but hypothetically) and send them to a wallet specifically created for this purpose. I wouldn't wanna mix these inputs with other inputs I have.
I know you specifically mention CoinJoins, but if you wanna go a little further you can read here:
https://kycnot.me/search?type=exchange and find more tools to ensure your privacy. One tool I use a lot is UnstoppableSwap which allows me to basically swap between Bitcoin and Monero in a fully self-custodial way. Technically you could get rid of these UTXOs you own switching to monero and then follow the same steps in reverse to get fresh Bitcoin back.
P.S in case you choose Whirlpool coinjoins, make sure to remember that it creates change UTXOs in an account that it calls "Badbank". Treat these UTXOs carefully.