I've definitely struggled with GAS.. I just finished a comic and touched on the topic in there.
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There are a few things I am telling myself right now, as I'm dealing with a bit of an extended episode.
-There's a ton of cool gear out there that you know, and have researched, and haven't found yet.. You won't have it all. can't have it all. You don't need it all.
-Looking for things is a distraction. You need to use time making music, practicing music, listening to music.. not worrying about finding the perfect.. whatever.
-You need to learn your instrument. Learn every way to make it sound differently. Invest time in
thoroughly learning the gear you have.. then if there is some huge deficit or thing you know it can't do or won't do, you'll have a sound reason to look for something else, but often times, there is no problem.
-You are not a serious musician, this is a hobby.
-Most of the greatest players weren't huge gear heads. They played the instruments they had. They spent time on learning their instruments and making music. (I've really come to this conclusion recently as I kept searching for tone). Make your own sound, no need to try to copy someone else.
Again, these are the things I tell myself.. the conclusions I repeatedly come to. I'm sure there's more, but I'm a bit of a minimalist and only ever really need one bass and one guitar. I've just whittled down my most recent splurge of 4 basses and 3 guitars down to one and one (well, still have to sell a Rumblekat and a Wildkat), but then I'll have two super cheap Squiers.. an Affinity Bronco (with a cheap BiSonic) and a Bullet Mustang (with cheap P90's).
I often think of the time spent "researching" and it makes me sick. I could have created so much music or art, or read something cool.. or anything really. Gas really gets me nowhere. I've got to learn to appreciate and use what I've got.