Just a few thoughts:
* Don't create channel between 2 already connected nodes. (e.g. check via LN explorers)
While this might be true with some of the biggest nodes, sometimes opening a channel between 2 connected nodes can help with rebalancing. You are creating a triangle that can possibly rebalance within one or two hops.
True, good point!
* If a channel isn't routing anything for a long time, close it.
Sometimes a channel doesn`t route, because liquidity is on the wrong side, or you need another channel with one of other node´s partners to see sats flowing through it. If liquididity stays on your side for too long, try to rebalance another channel with that liquidity and watch if the node pushes back those sats.
Oh yes, that was assuming a balanced channel (enough funds on either side to theoretically move if there was any demand for it).
When other nodes are opening a channel to mine, I try to rebalance that channel for a reasonable fee and put my fee about 50-100% higher. Let`s say I pay 200ppm for the rebalance. I would start with a fee of 400ppm and go slowly (about 1-2 times a day) down in like 10ppm steps until a routing takes place. If a node doesn´t route anything for a few months, I pull all the liquidity to my side and close the channel.
Sounds good!