What really unblocks my solar plexus chakra?

I've spent the last year just healing myself to reconnect with my sense of self. I began with affirmations and breathwork centered on my solar plexus chakra, seeking greater confidence and decisiveness. Even after all this, I can still feel something tugging in my stomach, similar to an energy block that I'm not able to move. I want to move beyond shallowness and know what really works. What practices actually unblock the solar plexus chakra in a profound, lasting manner?