When in doubt ..

I’ve been with my wife for 8 years(married 4).. love her to death for her heart , her beauty , faults etc.. our life is good .. the only thing that bugs me is we can go a month or two without having sex .. i personally would want it every day .. my wife is gorgeous ...I know she overthinks everything especially about her appearance but I tell her all the time I am 100% madly in love with o my you... she on the other hand will always say I’m just not in the mood .. I don’t get mad. But it’s beyond frustrating .. I’ve asked is it me ? I love to go down on my wife .. and she loves it and I know I’m good at it .. she has sworn numerous times it’s not me , she’s just not in the mood or tired .. at some point this will change I hope ? I would be ecstatic if it was once a week or 1-2 every two weeks .. I don’t know what to do anymore .. I do the laundry I cook (100%) of the time . I’ll send flowers occasionally to her work or grab them for her at home .. any constructive advice would be helpful :)