Well first of all…much congrats on ID’ing the issue…(excuse me) I have had a few too many drinks…but this should just make my answer more real and lively, ehhh , mmm yesss! I respect you a lot…20 years…awesome!!! And still fucking…mmm. OKay, well …did you guys, I mean I must assume you have been trying it all…but can I just be naïve and say you have not…
what about…
-fantasy vacations
-role plays
-bdsm
-switch it up
-threesomes?
-more foreplay (women always usually need this, esp if the energy is out of whack)
-tantric massage—tantra/arts
-massages
-porn
-body painting
-clit piercing
-nipple piercing
-voyeurism
Did you do the usual physical/health exam first to see if there are any underlying medical conditions that would cause her low libido in the first place/vice-versa??? Or anything that is a constant trigger? I know you say it is “always” but maybe there is more of a “trigger”…like…the way she “feels”…does she like lingerie…? Certain scents…can be instant aphrodisiacs (sorry I cannot spell right now…too many beers lmao—excuse any errors) …even foods!!! umm yes can be turn-ons…yeaaaa babbyyy
even if a man cleans the damn fucking house for once…lmao
okay…what else
strip clubs??? I mean magick could only be the beginning!!! A nice ritualistic bath…setting up the bedroom…but this could be a whole NEW ADVENTURE FOR YOU TWO!!! OMG!!! The fun!!!
Ever do collars…whips, chains? blind folds? …I am not talking about making each other bleed or anything…but hey…hehe…candle way…date nights (go back to those good old “sexy date nights”) women thrive on the nostalgia…what do you remember type shit…they want to be swept off their feet and panties dropped lol…oh yeeeahhh…wined and dined…for sure.
I am sure this would get her juices running and more.
Different lighting…mood music (tantra…metal…aromatherapy…oils…lubricants…foods)
hot/cold play----yes…ice baby…
There honestly is so much you can do and try…I am not sure I can offer too much more without knowing anymore specifics (as you may have already tried this yourself!!!)
Most importantly: HAVE YOU ASKED HER? Maybe she has a FANTASY THAT SHE IS DYING TO LET LOOOSEEEE…let that freaky bitch come outttttt…SET HER FREEE…just ask…sometimes the simplest answer is just received by asking.

ALL WOMEN HAVE A FREAKY SIDE…IF SHE SAYS SHE DOESN’T…SHE IS A L-I-A-R!!!
damn…you two will have so much fun exploring…regardless
take a couple trips to tons of stores…try it ALLL
who cares
no shame in the love game
SEX SWINGS
CREAMS TO STIMULATE
USE TOYS (dildos/anal beads/clamps/mini vibrators/panties—remote controlled)
MAIN THING***** USUALLY: MEN need to DOMINATE…BE DOMINATE!!!..NOT A DICKKKKK, NOT AN ABUSIVE DOUCHE BAG…BUT BE DOMINANT…GRAB HER HAIR…HER NECK, BITE HER NECK…TELL HER YOU WANT THIS, CALL ME DADDY …YOU BE READY BY (whatever time you are coming home, GIVE HER A TIME) damn…she will be READYYY and weetttt lol…add in some dirty sexy talk/texting/notes…sure may seem not natural at first…but it is ALL NATURAL…we are MEANT FOR THIS…RAW AND CARNAL…
20 years!!! hell no…NOTHING OFF LIMITS…ENJOY!!!