Adelaide Hard Start - D&D5E + homebrew
This one’s simple. The more authentic you can make your character’s personality, interactions and responses to their environment and situation, the faster you’ll level up.
I’m interested in RPGs as a medium for communal story-telling. If you participate in this aspect of the game, then you will prosper. A GM d20 roll might suddenly tip over to a 1 instead of a 20, or you might be given advantage on a roll because you’ve done something funny, emotionally charged, outrageous or even just particularly in character. A character sheet might show up with an extra diamond on it in payment for services rendered from a flattered customer, or missing 20gp after you’ve annoyed the wrong pick-pocket (i.e. me) by falling back on violence as the first resort in all situations.
You get the idea. Make it fun. Make it interesting. Make it AUTHENTIC. Embrace the RP side of RPGs and you will reap the rewards.