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Ok, it is difficult without a full set of data. But if traffic has dropped and not rankings, then it is seasonal.  Mortgage Broker is a big term, so if that is still ranking 1 then sounds ok. What does sound concerning, is it now sounds like you have a number of sites and they could be interlinked ie a PBN.. so have to factor same in. It is tough to advise, but my view is if rankings have remained the same and online visibility if you are tracking - then all is good.  If rankings for mortgage broker and visibility have declined then it is a problem and site audit should be undertaken asap. Not sure that helps,  as data sets not great, but hopefully a starting point. Regards