You are welcome, may I suggest to use BtWquests & BtWquests: Shadowlands

    1. https://www.curseforge.com/wow/addons/btw-quests 
    2. https://www.curseforge.com/wow/addons/btw-quests-shadowlands 
    These will help out with the progression of each chapter and presents each quest in a tree form etc. It also provides prerequisites which is needed, all in-game, no alt tabbing or switching from one monitor etc.
    I find this addon easier to use and better laid out compared to questcompletist. I also believe BtWquests is also updated more frequently as well.
    If you need any help with these addons, or quests in general, anyone is welcome to add me to Discord Ozzi#9217 or Battle.net Ozzi#11426 just let me know it’s you, I don’t accept invites with no notification as to who it is.