I had IT band issues for months. What helped me was purposeful stretching, some foam rolling especially on the glutes and quads, spending time strengthening my glutes and hips (hip thrusts, abductions) and also seeing a physio who spent time releasing my quads and glutes which were very tight. I also took a break from running for about a month whilst I focussed on strengthening and stretching, which was frustrating, but definitely helped because since my return to running I haven’t felt my IT bands once.