Highly recommend Barbell Medicine if you're interested in evidence based strength training info. The best workout routine is one that you enjoy and adhere to. Progressive overload (which is NOT just adding weight) is important for progression too. But you probably don't need to go "as hard" as you think - somewhere between 2 and 5 repetitions from failure (RPE 5-8) is fine assuming you're in it for general fitness/health (but even if you aren't).