This bears repeating and Catt alluded to it as well. Also, fishing with someone better than you can be very helpful. There are far better anglers on here with more expert advice than I, but this has worked for me. If you fish alone most of the time, I would suggest the following:
Learn a small lake known to have decent sized bass first if any are available in your area. The time on the water thing takes less time if you have less lake to learn. Large reservoirs of a few thousand or tens of thousands of acres have lots of unproductive water and if you don't know where to look you can really get frustrated. Become proficient on smaller lakes and then apply what you learn to larger lakes. (Missouri's fishing app provides a list of all conservation maintained lakes. They also periodically provide prospect reports that describe the fish population so you know the size structure of the bass in many of the lakes. Hopefully you can find something like this online, or in an app for your state, to help you narrow down where to find larger fish.)
Minimize the techniques you are trying to learn, but make sure they are in different sections of the water column to address different situations on the water. (i.e. Don't just try a number of moving baits. Try maybe three moving baits that cover the upper water column. Do the same for mid-depths. Also try slow bottom baits like T-rigged worms, creatures, and jigs when the conditions warrant it. A couple of finesse baits would be good to learn as well. And make sure you spend time with them to actually develop confidence in them. If you become proficient at fishing two or three baits for each section of the water column you will be equipped to catch fish and more likely to find the bigger fish.)
Develop a schedule to practice the art of casting. Accurate casting is paramount. I would throw in that you should at least learn the pitching technique during your casting practice (and I would learn flipping as well). Being able to place a slow moving bait right in a small hole in brush or under a dock will increase your chances of catching bigger fish.
Learn to handle your boat or fish from the bank in a stealthy manner to avoid spooking fish.
If you think about it, all of the things mentioned above take one thing and that brings us full-circle back to time - time on the water fishing, time on the water or in your yard casting, time in the boat learning to handle it properly. Take time and enjoy the journey.