Hm.... running a "routing node" is a black art and there are no straightforward ways to make it successful...
But i if you want a channel that is guaranteed to stay open, with high payment reliability... we recommend these steps ...
1) Get a channel from Megalith LSP .. https://megalithic.me/get_a_channel
2) Be sure to use the channel at least once per month
3) The channel should NEVER close