I was about where you were 40 hours in. Then I bought this game on switch so I can take it everywhere with me and have since dumped about 500 hours into the game. I only recently got all characters to A20. Still working on A20 heart kill and a few other achievements.
It's always intrigued me seeing other people pick up the game and master it much more quickly than I did. There's some people that get their A20 heart kill just 100 hours into the game.
I really enjoy the feeling of slowly but steadily gaining knowledge and intuition about the game - in the 500 hours of play there's been no shortage ah-ha moments throughout. Truly one of the best $/entertainment value games I've ever purchased.