I'm thinking you need help to search for Bubba. It's too big of a job to handle on your own. This is the website of Lower Alabama Search and Rescue:
http://www.lasar.net/
I have no personal experience with SAR and maybe someone else can give more specific advice, but I believe the investigating LE agency has to make the request for a search. And I think it's up to you to get LE to make that request.
You need to be in regular contact with the investigators on Bubba's case. Not in an obnoxious, in-your-face way, but be persistent. Let them know you aren't going away until Bubba is found. Make sure he is in the front of their minds on a regular basis.
Organize vigils on the 23rd of every month. Make sure his children are there. Give the media something to report on, to remind everyone that Bubba is still missing.
Social media is a great tool, and you need to make the most of it. Get Bubba's flyer out to every missing persons group on Facebook to get his face and name shared far and wide. Post his flyer on any community groups in your area. Ask people to share it and keep sharing it.
Keep Bubba's missing page active and constantly updated. Give visitors a reason to keep coming back. Let them know about progress or lack of progress in the case. Let them know what they can do to help. Ask people who live in the area of Bubba's last phone pings to check creeks, ponds, woods, and fields near their homes.
Consider starting an online funding account to hire a private investigator, if you feel like LE isn't doing enough to find Bubba.