Simply to modify the verb rendre with the adverb souvent to express "frequently / often" rather than just "visit"
So it is the difference between "paying a visit" and "paying a visit frequently / often"
Hope this helps.
Yes, the default position of an adverb is right after the first conjugated verb.
To add to Alan(Jim)'s answer, here is a more detailed answer from Cécile: adverbs-to-start-a-sentence
I hope this is helpful.
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