You remind me of my little cousin,he's been obsessed in fishing for big bass ever since I helped him catch his first big bass last year.He fishes almost every day and already caught a +8 pounder from land in less than a year of seriously bass fishing(he lives in the Lakeland area,so he is surrounded by big bass). I am going to tell you the same thing I told my little cousin about fishing for big bass...the most important attribute you need to have is to be persistent and understand that targeting trophy bass is difficult,no matter how good you are.Dont give up and do your best to learn something new on every single fishing trip you have.Write down all successful fishing trips(date,what lure you used to catch the big bass,weather conditions,moon phase,where you caught the bass,what depth you caught the bass,etc).This information will help you learn how to be more consistent in the long run,so its worth it.Don't forget to have fun in the process and give yourself breaks in bass fishing(fish for something else, practice another hobby,etc) so you don't burn out.
With that said there is no 100% guaranteed lure that will catch you a +8 pound bass or better on each trip.Every body of water is different and every day is different, so what might work today might not work tomorrow.A swimbait might catch you a big bass one day and then not catch you any bass for several trips.A small hollow body frog might catch you a bunch of small bass,but one day might catch your next PB. Be patient, be willing to put in your time, and you will eventually catch the big bass you are after.