by technical expert, i am guessing that you mean software, since you think you lack RPG skills.
while there is a lot of RPG out there, and i encorage you to learn it, remember that RPG is just another language. the actual software is a collection of objects that support one or more systems.
by knowing how to define a program, especially if you can define a series of interlinking programs and files, and can come up with solutions, you may find that you’d be just as suited for Project Manager, System Admin (it’s not all programming), networking and even the Analyst because of the skills you’ve acquired.
i dont know how much “free” time you have, but i’d start by creating some simple programs that allow data entry, display with subfiles and some reports in RPG/IV. there are tons of examples on the web (if magnetically interpetated 1s and 0s have weight and/or mass) .
also, go to websites like MC Press Online and System i Network and www.RPGIV.com for examples. you’ll not only find good sample code, but also friendly, if somewhat sarcastic at times, people who have been in your position.
as for stopping support for the AS/400, that could be true, but with the number of RPG and COBOL programs out there, the programming platform will still be there.
i started on a /34 back in ’81, dont see that anymore, but the language, though somewhat evolved, lives on.