If you want to do something specific in a story, you need generally speaking 2 things.
1st is a motive
2nd is a means to do it.
There are multiple ways listed as a solution to this 6 month issue, and in my opinion there are individuals in every ending whom have reasons to help you.
- The Aldecaldos consider you as family, and more than willinh to help.
- Mr. Blue Eyes needs your talent, as living legend and the best merc in Night city.
- The same is true about Arasaka, no matter if you have returned to Earth, or stayed in Mikoshi.
- Lastly, we know that Johnny considers you to be his closest friend. To him that is more than enough motivation. Hell, I can even see Alt sending you back. She tried to get into Mikoshi for years without success, but V did it. Wathever her plans are, she could use a field agent who can do some things for her.