by Redmind
Redmind have facilitated countless of retrospectives in a wide range of teams. Ask them for help with setting a good theme for your specific conditions or facilitate it for you if everyone wants to participate 100 % as a team member or even coach you through the entire process.
Check out their services and contact them at https://redmind.se/services/re
Download the Retrospective guide here and feel free to contact Redmind with any question.