How to get to 2000 Elo with limited time

Long story short I plan on this:

-Lichess: playing with people/bots and using the study tab to learn an opening for black and white side

-chesstempo: puzzles

I know someone who got to a 2100 rating by just a few advice, an opening and just playing and I might be overthinking it. But generally I just want to be able to get a 2000 Elo rating by only playing 30 minutes a day, so my question is I’ve been contemplating finding one more resource because I feel like I will be missing skills if I just use the resources I mentioned… but should I? If not: then maybe a tip on direction, if so: What is one extra resource that I should use, I’ve been contemplating books and stuff but there is so many opinions and I just want one extra resource that can help me to get to a 2000 Elo type of style playing. Thank you.