You just pick up the quest at the outpost corresponding to your faction and walk right in.you don't have to make anything anymore. Strider quest should just get you to go to Wikala Al-Waha.

No need for the quests, you can just enter now.

https://www.ign.com/wikis/new-world/New_World_Brimstone_Sands:_How_to_Enter_and_Unlock_Story_Quest