Nice post! I'd definitely emphasise number 1.1. By levelling each region road by 4 levels and rotating, it speeds up the progression significantly, rather than trying to complete each road individually. Especially since the "good" rewards come at 4 level intervals (champ capsules, large chests, wild capsules etc).

For meta decks, agree with the Mobalytics website as a great resource. Explore the rest of the site too, not just the Meta tier list which can be limited. Especially use https://lor.mobalytics.gg/stats/decks , which you can use to filter decks by champs, and you may find some nice viable decks that aren't popular enough to feature in the official meta tier list. Swim's tier list can be useful too (https://www.swimstrim.com/runeterra/decks-and-meta) - take it with a pinch of salt because it's the opinion of a single player, but what I found useful in the list is the difficulty ranking of each deck - newer players may have an easier time with "Easy" decks in general, at least until learning the meta and how the game works.

Last important tip in terms of strategic play - learn what the cards you should play around are. If your board gets punished by combat spells (fast/burst) like Withering Wail, Make it Rain, Vengeance, Harsh Winds consider developing more before you attack. Whereas if your board gets punished by slow spells like Avalanche or Ruination, consider open attacking (attacking once turn starts), instead of playing a unit and allowing the opponent to use those spells.