This is just my experience so this may not fit y'alls situations:
After reading the Modding.wiki --> "Two Major Announcemnts for the Bannerlord's Modding Ecosystem"
I downloaded the BLSE( Already linked by @ZoldFrog earlier in this thread)
Then on the dashboard on vortex with Bannerlord selected as my managed game
I went to tools and made the "Bannerlord Software Extender LauncherEx" the "primary" (What vortex will launch the game with by default when hitting the play button)
After that a launcher opens that looks similar to the vanilla, go to the mods and enable all the mods you have enabled in vortex.
Then hit play and continue your conquest of Caldradia.
I also did some spring cleaning of mods that I wasn't using anymore but I am unsure if that had any affect on the end result.