Being a jokester and how you act with outsiders are a completely different dimension from being wise. The two doesn't cancel each other.
Now to be wise you'll also need to experience things and mature, this may also change your character as well if you are still young, maybe you'll become more serious.
And serious is really the word here you say you want to become, not wise.
Being wise means knowing the truth about things, having experience, seeing things from a higher perspective, seeing things as they are, and such. This is very deep and of course have different levels.
Now I'm gonna tell you the truth as well, sadly or not sadly, it is definitely harsh for some, but reaching a higher state of mind, where you gain a lot of wisdom, a lot can be achieved with regular advancement, but higher levels are really not possible with it, but only with specific methods to open the mind and some related chakras like the 3rd eye. Much of these are not public but can be bought from HoO, but for example the meditation from Thoth shared by SGAI (search if interested) is an example of a secrete meditation (that was secrete until now at least), albeit being very simple, it does some very ethereal things with your mind that can hardly be achieved in any other way.
Now the reason as well why not everyone can have this (aka it's not public, not everyone have the funds, there are limits) is actually very just and everyone should know that everything works here as intended by the highest consciousnesses in the universe.
Now what you can do to build the foundations as Hailourtruegods said as well is to advance and read a lot. And especially work on the 3rd eye chakra (also keep them balanced and do purifciation cycles), Thoth ritual and his meditation (don't perform these last two too much, weekly is more than enough).