Just build things. You know how to use PHP, and you feel you are capable of building your application in PHP, use it. Programming languages are just a tool: if you know how to use a particular tool and that tool is a good fit for the thing you want to build, use it, don’t avoid using it because of trivial reasons. There is a corrolary to this though
To get better, you often need to be attempting things that are at the limit of (or just beyond) your current skillset. In this case, Laravel may make a lot of things easier. Using a framework to handle a multitude of common necessities in a webapp is often a sensible thing to do, it exists to make your life easier. It may not! I have no idea what you’re wanting to build, and it may be easier without a framework. But implied in what you’ve written is that you’re sticking with the basics that you know. Programming is hard, but as a general rule (this is not specific to learning Laravel or whatever), to improve you need to actively challenge yourself. You may not need to – if you can build the thing you want to build using the knowledge you have, that’s totally fine, it just depends what you want to take from it at a personal level. Nobody is likely to care apart from you (that’s not being denigrating – what you want to take from it is really important). Note that if that thing you want is just something like “make some money off this idea I had”, then just build it in the fastest way you know how.