I was in your shoes just a few weeks ago. I get what you mean my poor husband has not had sex since we had our child more then once twice a month. What helped us and me change this is by me telling my husband my fantasy. I have told him how to turn me on. In return that has turned me into a sex freak again. I cannot get enough of him. Maybe it is just time for a conversation of how can I get you into the mood. What is your sexual fantasy. Also best self cards have changed it as well. Intimacy Deck by BestSelf — 150 Engaging Conversation Starters for Couples to Strengthen Their Relationship, Romance, Trust, Openness and Vulnerability — Best Couple Card Game and Romantic Gift https://www.amazon.com/dp/B07W1PVNFC/ref=cm_sw_r_fm_apa_fabc_J1AWA47E2F5ADNR3GVTN?_encoding=UTF8&psc=1 these cards have changed my sex life. Also be patient with her. She is not happy with her lack of sexual drive for you. It is very emotional for her to not want you asuch as she once did. It is just as hard for her to not want you as it is for you. Please do yourself a favor buy the cards and try to get into what emotionally you can do to help her. Also another thing is the five love languages book https://www.amazon.com/dp/080241270X/ref=cm_sw_r_fm_apa_fabc_RYEK8AC13427MN978FT0 both of you read this and then talk about how you two can get closer. It is possible to come back from this as long as you start to talk now and wait for it to get worse.
I'm going to give you some LDR advice from someone who was in the same boat (actually worse because no direct flights and it was a 10-12 hour drive) and some life advice here:
This is their website: https://bestself.co/products/intimacy-deck?variant=29444525654085&gclid=EAIaIQobChMInozb4ufj6QIVEtvACh1s-ADmEAQYASABEgJ-KPD_BwE. But you can also find it on Amazon: https://www.amazon.com/Intimacy-Deck-BestSelf-Conversation-Vulnerability/dp/B07W1PVNFC