Faded for me once colleagues stopped switching to English regardless of my accent. That shift in how people responded mattered more than any confidence work I did myself.
My grammar is getting decent but the moment I open my mouth, my accent marks me as foreign and I brace for the switch to English. Some days I don't mind; other days it genuinely knocks my confidence. For those further along — does the self-consciousness about your accent ever fully go away, or do you just stop caring?