re: What is the best way to learn a foreign language as an adult?

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Obviously, immersion is unavailable to me.

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Kinda. There is DuoLingo which I think is good for vocab, DreamingSpanish and creating a Spanish YouTube account for comprehensible input (Google comprehensible input language learning), listen to only Spanish spoken music, free lang exchange apps/sites (half in the lang you want to learn and half in the lang they want to learn), create Spanish profiles on your streaming services and consume only in spanish, shop at local Latino stores and restaurants if available, hire a tutor for ~10/hour on one of the lang learning sites a couple times a week. There has never been a better time in history to have the available resources to learn a new lang. Its just a matter of how much you want to learn and the time you can commit. I recently went to Spain did DuoLingo, DreamingSpanish and switched all my content intake to Spanish even tho I didn't understand much at first about 2-3 months before and got along fine. Language is a pattern, and our brains are pattern matching machines, the more you expose yourself to it the more it will make sense. If you only need to get by at restaurants and stores you can acquire what you need for the most part over a few months of very diligent learning, to be able to hold meaningful conversations and express abstract thoughts in your usual personality buckle up for years.