In my case I have the least severe of the cases, with my mouth completely opened I still need 1 cm to touch my front teeth with my tongue.

   Somebody told me that for different reasons the tongue can lose mobility, so before getting into surgery I will try the next things:

1_ Strech the tongue, here is an study that says that by pulling the tongue for one months, its lenght during protrusion changed (around 3-4 extra milimiters)

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5702816/

   I'm aware that the study says tongue and it this stretching has probably no impact in the frenulum length, buut, the pulling used during the study was just one direction, what happens if we pull the tongue in different directions? 

Also the study was performed during one month, what if a person do this for months?

2_ tongue chewing and anything that increase the muscle tone of the tongue; 

   People have reported increased muscle tone in the tongue (and therefore increased size) by doing tongue chewing. Any exercise that also increase the muscle mass of the tongue is also useful obviously.

   I read a theory that the frenulum can be stretched during breastfeeding due to the stretch caused by suction. So one of the reasons is early wheaning.

   Also folic acid during gestation is blamed. So could consuming folic acid help with this process of enlargement?

   I'm still figuring out what the frenulum is, I mean the tongue is a muscle, but I don't think the same of the frenulum. Is it skin? because in that case it should be able to stretch

https://en.wikipedia.org/wiki/Stretching_(body_piercing)

   My last question is, does craniofacial distrophy gives the illusion or at least increase the effect of it? Let say that the craniofacial structure of a person with tongue is comes back to normal, would then the tie still be as severe?

   I've read that people can develop tongue tie as adults, (not sure about how true is this), but I would expect that if someone has been the last 20 years of their life not chewing properly, resting their tongue on the floor of the mouth and eating soft foods.