As a wooodworking college teacher, I value face to face education, in a workshop.
I’m not suggesting you sign up for a full time course, but perhaps you can find a short course that offers what you are looking for.
Lots of small business furnituremakers offer courses, for example intro to hand tools/furnituremaking, make a workbench, make a box. Lots of these around at 3-5 days. One of the colleges I work for also offers evening classes, which would also be a good option I think.
If you can these would be your quickest path to upskilling, as they can offer corrections on technique by reviewing what you are doing, offer all the tools and equipment you need to do the tasks etc.
another route is to pay to subscribe to an online programme, waters and ackland, Paul sellers et al. The useful reason to pay is because likelihood is higher that you are being taught the most sensible content.. YouTube or free education is a bit of a minefield, and needs sifting through with a fine tooth comb to figure if it’s actually appropriate.
I suppose the third and often overlooked option is to buy some books, and/or subscribe to magazines. Again, often you will find if committed to print, it’s probably worthwhile in some way.
You might not yet have the skills to discern if the free options (YouTube) are any good, as you may not yet know the optimum techniques. If you are committed to this path, try and apply a bit of simple critical analysis to the videos, for example are the achieving the results you desire ? Are they often cutting away, and magically coming back with a better looking piece that they haven’t demonstrated ? Read some of the comments and see if people are agreeing with them etc. You can pick up all you need on your own of course, but I have no doubt it will be a longer and at times much more frustrating journey.
As people have highlighted above, I liken learning furnituremaking to learning to drive a car, it’s only difficult because you have to do everything at once ! The skills (clutch control, operating the steering wheel etc) are mixed in with knowledge (speed limits, road signs) and alongside this you have to react to what’s happening in real time.
To liken this to what you are wanting to learn, if you break down the earning into excercises (I.e focussing first on measuring and marking out, then when you can achieve this best, moving on to sawing skills only etc) you will be less overwhelmed, and your improvements will not only be faster but also more reliable.
When learning skills like above, get cheap softwood, and only be critical on the amount you are doing for a start, not the end product. It’s practicing a new skill, so don’t spend a month trying to rectify one thing, try and do it right, if it’s not right throw it in the bin and do it again, and maybe make some notes about how and why it went wrong.
Good luck !