You might run a report on your database to find some leaks maybe.
If you want to, you could just post a screenshot here and ask others to take a look at and help to find spots that have room of improvement.
After finding some spots you can search for concrete content about it.
in the upper menue of RIO you find the point „more“ and then „learning paths“.
All the content is then sorted in relation to topics that might fit to the identified spot.
ps: reading here at the forums is definetly worth it as well.

I would start with theory videos. Try looking at a few. If there are some that you have no clue what the person is on about then you should study that!
But without knowing what exactly you want to work on it's hard for us to guide you towards certain videos.

I personally like Peter Clarke, Qing Yang, Henry Lister, Patrick Sekinger.

I agree with what the guys above have said in general and about the forum - reading their posts has helped me a lot.

I’d also suggest getting From The Ground Up - it’s a great foundational starting point. As an aside, make sure to get and work with the better software tools - I like Pio (or GTO+) for solving spots, Snowie for a gamified experience and somewhere to import hands for a pseudo-GTO recommendation, and Equilab for working through equity vaulluations. Imo working through these, purposefully playing & posting, and running through the essential videos are a great way to build a foundation.

Watch every single video. Start with theory and then proceed to hand reviews. After you finish the study start playing, applying what you learnt, finding leaks and then improve.

Some should advice you to start playing before you finish studying the foundumentals. This approach is wrong imo because you will make mistakes that you could avoid if you had watched 1 specific theory video for example.

About From the ground course I have to say this. After 250000 hands and reading the ground manuals I learned nothing from the course. Not to say most of the stuff you will find in essential videos and in better depth. However if you are a total fish the course is great introduction to some concepts.

And don't overlook the mental part of the game. This is the most important part of the game imo. I know a few guys that are professors in theory but fail in practice because simply they can't take the shit when it happens and it will happen for sure. This is the reason a lot of players simply give up.