Open more channels and if you can balance them.
I posted also a guide about how to use the ghetto swap method with known peers - that helps you very quickly to have liquidity on both sides (in and out).
But right now, if you already have a channel open FROM your node towards another one, means you have liquidity only for sending (outbound).
So you need somebody else to open towards your node a channel and in that moment you have INBOUND liquidity, so you can receive.
The rule is simple: more channels, more routes for your txs and others txs to be routed. Less channels, less routes.
Now, this doesn’t mean you will have to open like crazy 1000 channels in/out just to be able to send a stupid test tx. But with 2-3-4 channels with enough liquidity in and out is OK. Later in time, start adding more slowly.