There isn't anything like learning by doing in this field, especially with the pace of change, and I found most resources to be really scratching the surface and lacking the depth required, probably the reason Eric created this site in the first place.
That said, the good point is that you can learn realtively fast!
For starters, you might want to focus on developing a particular area: "user acquisition" is pretty broad. You could start with a particular channel (Social? Programatic? Content?), try to excel at interpreting creative data, mastering ASO, increase your analytics skill etc. Nail it down to something that either interest you, look promising or seems easier from your background. And only then expand broader. (in the mid term, I recommend strongly against keeping only one deep skill)
For resources beyond practicing, I found the best for me was to build a network of peers to ask to when in doubt. Ask your colleagues, join a few groups/slack, but better even build your own trusted network in the field: most of the times, you'll learn things that you can never see in blog post or account managers recommendations. Reading posts, talking to reps, looking at webinars, attending conferences, taking courses doesn't hurt, but in my opinion only helps marginally or as a complement. Maybe a bit more if you are getting started. That's partly what https://mdm.academy
is also trying to cover