I might misunderstand your post, but I don't see what benefit you currently derive from FB.
As you have noticed, you need a huge amount of miles to get a F award. As you don't fly much, you have been hit by successive devaluations of the FB program.
You seem to mostly fly domestic and FB is of little use. If you were on DL SM you might get upgrades. And spreading your limited travel into two skyteam programs seems a bit strange.