Are you playing zoom or reg tables? 6max or full ring? 100bb or 250bb buyins?
Any specified strategy suggestions would depend on what exactly you are playing, however in general you are in the right direction with reviewing blackrain material. His books are great for beginners, at least crushing the microstakes, while his newest book gets a little more advanced for the higher microstakes 25 and 50NL games.
I recently reviewed some videos he had on 2/5/10NL and found them to be great review and refresher for table selecting and not getting involved in spots that could get complicated or be marginal.
You want to be playing a TAG style as a beginner or to get back to ABC basics, so have a tight opening range and play aggresive, take the player types of your opp into account when continue if they put up a fight or start getting agressive themselves.
A big tip and something that always caused me issues in cash games when I attempted a grind on them, laying down
hands when your beat (like the flush gets there on the river and the villian donk shoves his stack for the 5th time this session) will possibly have the best effect on a winrate. We always have the feeling they can't have it everytime but most of the time they do in this scenario, not always but most of the time.
The micros generally with exception of the decent tag players or the maniacs and spewy lags is very passive and they will let you know when they have made a hand, we just need to learn to listen to the information they are providing. Just like we don't need to be correct all of the time to make a certain play, this also works for the play of hitting the fold button as well .... and there is nothing more tilting then getting stacked by a fish when they basically say "I have the nuts" and you call anyhow because you don't believe them.
GL on the restart with 2nl, its where I'm currently grinding as well (although hopefully not for much longer) but mostly on the 250bb deep tables.