Skyrim Is there any mod or command to reset all towns

Locations only show up if you have enough gold to travel to them, it is likely that your newer character did not have sufficiant gold to travel along the more expensive routes.

PlaceAtMe will create a copy of the NPC.

Instead:

• If you can see the NPC, select them with your mouse. This will show the refId just above the console.
• If you don't know where they are, type prid XXXXX (where XXXXX is npc refId)
• If you don't know the refId you can either:
  • save your game, load a previous save, select the NPC and write down the refId
  • locate it by searching one of the Skyrim wikis (like Wikia)
  • type help <npc name> which gives you the base id and you need to convert that to the refId.

Then, type moveto player. This will only work if npc is alive: if it isn't, first type disable then enable then resurrect 1.

Alternatively, if you want to go to the NPC, type player.moveto XXXXX, where XXXXX is the NPC refId.