To me, this is a serious and important question, so I will attempt a serious answer in the space given.
YMMV
If You are (for the moment) not feeling any tugs from Your libido, there are many possible causes.
A) Surface causes usually include physical health: are you getting enough water, nutrition, vitamins, protein, exercise, sun light, etc.
If any of these is severely deficient, improving them can move the needle a bit and give You a better baseline for all activities. Remember: it (may) take 30 days of doing something for it to be a habit. Also: if You try removing something which has been a part of Your life, You need to wean Yourself off of it and likely replace it with something else to do so safely and effectively.
B) Overwhelm in any aspect of Your life can be emotionally and energetically draining and impact anyone's libido, whether work, family, home, finances, politics, etc.
Possible solutions include: solving the problem!
Realizing the things You cannot change and letting them go/giving them less power over You. Scheduling time for each problem, worrying/fretting/complaining/yelling all You like during that time, and leaving it alone after that. Repeat appts may be necessary.
POSSIBLY HELPFUL:
Any of the typical grounding exercises may help at one time or another: deep breathing, EFT/tapping, box breathing, 54321 (time on each sense), guided meditations including body scans, white/brown/pink noise playing in the background, visualizations, Tai Chi/Quigong or other slow, purposeful movements, or for some people dance/ecstatic dance, improv... And what speaks to You and Your body and Your soul...
C) One possible emotional cause is that You've gotten used to the roles and the scenes and maybe everything feels like You've done it for the 100th time. Some people yearn or lust for more novelty and spontaneity while others don't - or don't in certain situations. This feels like an important topic which most people seem to never address or be aware of.
One tact to address this is to be more present and in-the-moment. Doing so could look like simply being more aware of the physical actions taken and observed, or hearing some of Your thoughts about the actions or activities, expectations or things You never noticed before. You might feel inspired to go a different direction - or maybe next time. Just having more awareness, more involvement in the activity may inspire something now or later, or give Your mind something to consider afterward about how You showed up, participated, or subtleties in simply liking or disliking things...
D) If You are willing to go into the deep causes, there is likely one or more things which have gone off track over the months, possibly so slowly that no one noticed. Or so automatically that it never came to Your conscious mind.
When I became less interested or totally disinterested in my partner of the time, it was because it had started a while ago with a sudden and subtle realization that I couldn't fully trust them - which meant I couldn't fully be my Self around them. That lead to less sharing, less openness, less spontaneity, and less active caring and participation since I couldn't figure out how to engage with her as she actively avoided communicating about most tough topics. That made it seem like forcing the issue(s) would only end the relationship faster
In one case, I was just a Top for her, in another I was a generic boyfriend - rather than being more my Self.
So I will generically see this state of libido indifference as having underlying trust and safety issues, whatever those may be.
But I only know my experience, not Yours.
