I don't know who can exchange their currencies such as Bitcoin and currencies of high value with currencies that are not listed and have no value. Yes, there are boards here, so you can publish a topic about that, and I hope that you will find someone to help you in these transactions, although I doubt that there will be someone who will have the desire to obtain these shitcoins like Pi network. You can always deal with members with high rank, or you can use an Escrow service so that the safety rate is high, and stay away from scammers who ask you to send your coins first via private messages.