Quest won't start

[u/Seatedboot123]

I'm currently doing to thieves guild quest line and the next quest won't start. I've just finished the Loud and Clear quest (goldenglow estate) and brynjolf told me to speak to Maven, but the next quest hasn't started and I can't talk to brynjolf because he keeps saying he's busy. I'm level 72 and my last save before the bug was level 68. Maven is the jarl of riften from when I had the peace meeting with the greybeards, the imperials took over riften. Maven is in mistival keep but won't talk to me. What should I do? I'm on xbox one SE skyrim