Pop 50-100mg of viagra, bam done. If you want to step it up further you can also take Citrulline/Arginine/Yohimbine but it's overkill. Alternatively, you can take cialis which is objectively the best of the PDE-5 inhibitors.
Yes, it's not addressing the "root issue" but idgaf, it works, and they're the closest thing to miracle drugs. Plus, there is new evidence showing other unexpected benefits of PDE-5 inhibitors, cialis in particular.
As far as mentality goes - I find it extremely helpful to be in the mindset of doing whatever I like, rather than trying to please her. If you're not very turned on, it's either her fault or you two aren't sexually compatible. Stop putting all the emphasis on her.
This is counter intuitive but what turns women on is when you don't care what they want...of course still pay attention to how she feels and if she says "right there" don't you dare stop, but ultimately it helps to use treat her body like a living **** doll. Last thing, long & slow foreplay and dirty talk helps too. I for one love playing with their tits a lot (sucking, squeezing, etc) and fingering. Ideally when you actually fvck her she'll be begging for it.