Need Advice for a starting point

Hi, I am new to unreal engine and have enjoyed using the software. I have been watching unreal tutorials and creating small projects to get familiar with what I’ve learned. Ultimately I would like to develop a playable game eventually. I have already started on the environmental concept art, modelling some assets and which genre of game. The issue that I would like advice on is what type of game would be most suitable for someone such as myself who is just starting. I have 3 options that I would like to pursue: an open world, a game where levels are selected from the main screen and multi-player. Something that is just hard enough to be challenging but still obtainable for a novice such as myself. Any advice is welcome and thanks to you all in advance.
P.S. the genre that I have chosen is a racing game