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I'm the same as you )other than being a Physics graduate). Love Michael Penn. Interesting topics with a good but not pedantic level of rigor.

https://youtube.com/@MichaelPennMath

I'm a huge fan of Michael Penn's intro to various subfields of math videos, like the one on vertex algebras. He does a great job of balancing definition with motivation so that it doesn't feel like wading through a meaningless sea of symbols.

Forgetting so much is my current fear as well. What did you end up doing?

It hasn’t been nearly so long for me, but I’ve managed to hold on to much of the math I’ve learned by re-proving theorems I’d learned and solving problems in my head during downtime, while doing household chores, and while falling asleep. Another benefit is that I am almost never bored since there’s always more math to do.

Just block off regular times to do the math you want to remember a few times per week at least. Maybe even 30+ minutes per day.

Solve problems. Prove things. Etc.