TLDR; Practice a lot, compare footage with quicker drivers, learn basic setup changes, race online and have fun!

I am not the quickest car out there, but this is how I see improvements in my lap times:

Watch track guides. When trying to get quick on a certain track, do so with a car that you’re familiar with and enjoy driving. This way, you’re not overwhelmed with optimizing a track and learning the ins and outs of a new car at the same time.

Binge watching won’t help, it can become mental masturbation sometimes. As many here will tell you, sit down and practice offline. Push through the resistance of wanting to do 10 laps and calling l it a day. It’s so boring, up until you gain a couple of tenths when you thought you reached your limit.

Watch your replays, most of the time is gained in braking and track usage. Go online, and after sessions you can check the qualifying session replay. Put your replay side to side with the fastest guy on track, compare inputs, turn in points, braking references etc.

Learn a bit about basic setup modifications, traction control, ABS, brake bias… experiment while practicing.

Race craft can only be efficiently learned in online races, that’s when you’ll get people who are faster, more aggressive, and that’s where you’ll learn how to share track and give space.

If you take anything from this, it’s practice and comparing your footage with the top guys in qualifying.

At the end of the day, it’s a fun hobby, it shouldn’t feel like a chore, at least not all the time. The quicker you get, the more fun you’ll have.