If you're switching from Journey To Valhalla, I would make sure that you do a CLEAN profile and install RTMN and then install your other mods, JTV has files that can interfere with my modpack due to Spawn/Drop/Raid files and you'll get warnings of missing spawns or drops because of the files from JTV.
Doesn't contain EpicValheimAdditions since this modpack is already filled with stuff from Therzies mods and is more balanced, adding EVA would only add more bloat which isn't necessary
Doesn't contain RRR mods, my personal opinion RRR has issues and I prefer not to use that mod since there's already plenty of creatures to fill the empty biomes from Therzies mods.
Adding missing locations, You'll need to install Upgrade World and press F5 to open console and run the command locations_add this will place every missing location, I would also run the command world_clean so your world can be removed of missing locations and items etc to have a clean world.
Note: Please make a backup of your world before doing this incase you mess anything up
Information about RTMN
This is a vanilla-like progression modpack similar to JTV but is updated and maintained and is plug and play
Contain more bosses, creatures to fight, more armor & weapons to craft for all 6 current biomes.
This modpack does contain CLLC but it is set in difficulty to be vanilla-like, so everything will only go up to 2 stars and bosses will also go up to 2 stars max
Progression for getting new materials is locked behind boss keys, you will need to kill previous boss in order to mine up Bronze, Iron, Silver and Blackmetal, Kill Eikthyr for Copper and Tin to drop etc.
New bosses with altars from Monstrum:
Meadows: Asmodeus
BlackForest: Svalt
Swamp: Vrykolathas
New bosses with altars from MonsterLabz:
BlackForest: Frigga (Difficulty between Elder and Bonemass)
Ocean: Balder (Difficulty between Bonemass and Moder)