Moving on from Pathfinder 2e Beginner Box

I am currently DMing for a group of friends (first time doing pen and paper for all of us) using Roll20 and the Pathfinder 2e Beginner Box (Menace under Otari). We like the game very much and would like to continue using the characters and dive into a deeper story/longer campaign but I am quite unsure on how to proceed.

We are level 3 as of now after the box and an adventure I wrote myself using the guidelines provided, but it took me quite a bit of time to come up with the dungeon, the characters, the loot, the balancing, … so I would much rather use a prewritten adventure that I can GM (which is super fun!) so we can do regular sessions without me spending huge amounts of time writing the adventures on top of DMing them.

Are there any suggestions on how we can proceed to the full game (as far as I know the characters can transition easily, there’s just more rules and variety in the full game of course!) with an adventure path that can be started from level 3? Thanks a lot!