Naltrexone is definitely not the only option for reducing or quitting alcohol. There are other medications. The most effective treatments still involve psychosocial therapy. I really want to implement some kind of contingency management but it's really hard to convince the government to fund a program to give people free stuff for improving their addiction. It's really effective though. :/ If you want another attempt It's best to do so in accordance with a trained psychotherapist. It seems that it's hard to find one that supports other goals then abstinence in America though. I was recently given a motivational interviewing workbook in english I really like. It's a bunch of exercises and none specific so it can be used for any goal.
It seems that there are different thoughts in the US, going cold turkey rarely works, you need some kind of plan. You can also work with a psychotherapist if you want to reduce your consumption or quit. I also have a recent book recommendation I got as a Christmas gift you might like. It's none specific so it can be used for any goal. https://www.amazon.com/Motivational-Interviewing-Workbook-Exercises-Decide-ebook/dp/B08JH6M3MB/ it's a bunch of exercises in Motivational Interviewing a psychotherapy that's very effective in addiction treatment. A psychologist I work with uses https://www.amazon.com/Managing-Substance-Use-Disorder-Practitioner/dp/0190926716 often but it's aimed at abstinance their worksheets are free https://www.oxfordclinicalpsych.com/view/10.1093/med-psych/9780190926670.001.0001/med-9780190926670-appendix-2 :)