Sorry - my reply won't be really helpful to you, but I still want to say it because I think I have a bit different perspective on that problem and maybe that will be of use to someone.
I actually use that "forgot for half a year" approach to "curate" my wishlist. I usually aggresively wishlist a bunch of games during game events and so on, and then, about once a year I return to my wishlist and ask myself, if I still remember what were in those games that caught my eye, are they still interesting to me? If I do not, and looking at trailer and/or screenshots does not hype me up again, then it does not worth spending on (at least right now). Then I remove those that I decided to not play at all from the wishlist.