HyperNeutrino is back!
V, 64 bytes

i/\
\/&#27;16ñH&gt;GMÙXppjÄXppñ5O|³² |&#27;M3lR@HyperNeutrino Welcome back!


Try it online!

Hexdump:

00000000: 692f 5c0a 5c2f 1b31 36f1 483e 474d d958  i/\.\/.16.H&gt;GM.X
00000010: 7070 6ac4 5870 70f1 354f 7cb3 b220 7c1b  ppj.Xpp.5O|.. |.
00000020: 4d33 6c52 4048 7970 6572 4e65 7574 7269  M3lR@HyperNeutri
00000030: 6e6f 2057 656c 636f 6d65 2062 6163 6b21  no Welcome back!


Explanation:

i                             " Insert:
 /\&lt;cr&gt;\/                     "   '/\&lt;newline&gt;\/'
         &lt;esc&gt;                " Return to normal mode
16ñ             ñ             " 16 times:
   H                          "   Move to the beginning of the buffer
    &gt;G                        "   Indent every line
      M                       "   Move to the middle of the buffer (the last downward facing part)
       Ù                      "   Duplicate this line downwards
        X                     "   Delete one of the leading spaces
         pp                   "   And paste it between the slashes twice
           j                  "   Move down a line (the first upward facing part)
            Ä                 "   Duplicate this line upwards
             X                "   Delete one of the leading spaces   
              pp              "   And paste it between the slashes twice
5O                            " On the five lines above us, insert:
  |³² |                       "   A bar followed by 32 spaces, followed by a bar
       &lt;esc&gt;                  " Return to normal mode
            M                 " Move to the middle line of the buffer
             3l               " Move 3 characters to the right
               R              " And write the following over the existing text:
@HyperNeutrino Welcome back!  "   Welcome back!