Solo mining is just as economically relevant as long it's through the node, imo :)

JAM is hit or miss. It seems to be under constant DoS attacks or something because it can be months where it doesn't work. Lately (last month or so), it has been working and I've a few hundred sats. I set my mix amount quite low so I don't earn much, but the more liquidity the better for improving all user's privacy (and my own UTXOs).