Any way to shrink leather shoe heel?

So I got a pair of Meermin Oxfords that at first were very stiff. I did not know that is totally normal, so I tried to stretch them out (I know I am stupid and have learned my lesson). Now after they are worn in, they are a bit loose in the heels and ankles. I already added those little heel pads that you put on the back inside (I can take them out w/o damaging), but would still like for them to fit properly without them. I cannot return them at this point so I am trying to fix them somehow because I really do like them.

I have read that you can spray water on the spot you want to shrink and use a hair dryer, afterwards applying conditioner to repair the leather. But I am worried that could damage them and also probably not even work.

Is this something a shoe repair shop could handle? Has anyone had experience shrinking leather?
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