I haven't PRed in a while. Yesterday I hit a new deadlift PR. 405lb 2 rep max. It isn't as much as some people can do but it is a PR. More importantly it is getting my closer to my goal of 450lb 1 rep max.
This all didn't happen over night. I'm training to it. I'm not just going at it adding weight. I have a plan. I have a program.
That is what you need to succeed. This is true in lifting and in life. Set your goals or PRs. Program / plan a way to reach them.
You will have struggles along the way. You might have to adjust the plan. You might be a little off in your planning. Ultimately you will be a lot off without a plan or a program.
If you are not sure where to start look for people who have accomplished what you are trying to do. Look for those people who consistently break PRs. Study what the do. Find out who they learned from. Take that knowledge and mold your plan. Learn the program. Be flexible but don't give up.
Go get your PR.