Don't worry about breaking 90 so much as shooting bogey golf. It's a whole different and positive mental state when you know that a mistake on every hole is not hurting you. You've probably passed the state where you know the distances for your clubs and can rely on them when planning shots. The next stage is the good miss. Some might call this luck or course management, but it's really the difference between an awareness of your weaknesses versus a focus or fear on them. The result is that although you are still planning to hit offensive shots, your misses end up away from trouble vs into it. There are two main skill areas that can get you into this zone: shaping shots and the short game. Improving skills in either can get you onto the couple of extra pars side of the bogey golf zone.
I think there are secrets to getting better at golf and that those same secrets apply to skiing. One secret is deciding what pieces of your game need development and focusing your efforts productively on those areas. There are lots of golfers who go to the range and practice to get better, but either don't practice on the right things (e.g. just beating balls to make a better swing) or ingrain the wrong movements with their practice. Sure lessons can help this process, but there'a difference between relying on an instructor to fix problems and using an instructor as just one tool in a plan to get better. That's the secret. Another secret is adjustments. Great skiers know how to make subtle adjustments to adapt to different snow conditions (e.g. using turn shape to control speed). Skiers can adjust turn size and edge angles the same way that golfers can adjust shot shape and length of backswing. Better golfers have a larger bag of tricks for adjusting to wind, bad lies, hazards, etc. Some may say that adjustments is not a secret because we all do it all the time already. But can your bag of tricks really ever be full? How actively do you work to increase your ability to make adjustments and use those adjustments on course? Most golfers don't do this nearly enough and that's the secret. My final BS secret for today is great offense gets you birdies while great defense gets you lower scores. Most golfers focus much more on making great shots than they do on "preventing" extra shots from being added to the card. When you've got a 10 foot downhill breaking putt for par, do you play to hole it and maybe miss big or play to get it close and maybe hole it? The secret is that knowing when to take your medicine will lower your scores. In skiing, the skiers that constantly push the envelope are the ones that get injured the most. Knowing how to dial the intensity of your skiing back (or up) to the 80% level is this version of the secret for skiing.
In my quest to move from bogey golfer to single digit handicap, I've gone through dozens of different mini programs including lessons, training devices, acquiring distance measuring devices, changing clubs, changing balls, changing swings, developing new short game shots, changing swing thoughts, and improving emotional management (e.g. laughing at bad shots instead of destroying clubs). Although several areas still need lots of work (especially the last one), there is one inconsistent pattern. Sometimes these efforts work like putting a puzzle together. You can tell you're making progress but it takes a while to get measureable results and then all of a sudden a really good score happens. Sometimes they work like climbing a ladder. You get results right away and you can "see" more of the whole game from being higher up on the ladder.
Like you, I've accomplished my goal for this season and am now working to make the change permanent. I know that as winter approaches, the golf will get harder and my handicap will drift back up. But I do take solace in that, after all this hard work, I've finally beaten this #$#@^%%$ game to the point where I can now live in the fantasy that I am controlling the game instead of vice versa.