Heads up - I just booked two consecutive weeks starting Jan 4 2025 at KoOlina with my points and their booking system has changed with the new Abound system. Previously, the rep could see your total point balance - both 2024 and 2025 points - and the search would use the total point balance. NOT anymore, the search will only use the points for the year of the search - in my case, 2025. As such, the search would only pull up 11 days of availability instead of the 14 days desired. Plus, I think that I got a newbie rep - which contributed to the problem.
Luckily, I figured this out when I viewed the confirmation and found that they had charged only against my 2025 points - versus in the old days, it would always charge against the oldest points first. I called back immediately and was on hold for 45 minutes and luckily the 2 weeks were still available - so the rep cancelled the original 11 day reservation, banked my 2024 points to 2025, and reserved the two weeks. The rep confirmed that they can no longer see your total point balance while booking now - you need to tell them in advance.
Things are always changing and I too, like the OP, only book my Marriott points once or maybe two times per year. Even had problems figuring out the redial button on my new phone this year - LOL!