2D narrative. Like visual novels or Graphic adventures. You can try: RenPy, AGE ,AGS, Tyranobuilder , Visual novel maker
2D-3D RPG oriented: RPG-tools, RPG-paper-maker,Bakin , SRPG
FPS: FPS Creator Classic (with BIM), GameGuru Max, EasyFPS Editor
Many types of 2D or 2D-like: GameMaker, Stencil, ClickTeam, 001 Game Creator ,
Many types of 3D: UPBGE , MANU, Coppercube , RANGE, Armory 3D
Resources: Open game art, Fifty sounds, itch.io store assets, itch.io store tool, Mixamo
If you want or have to work alone. Try a couple of engines that catch your attention, try to make short and simple games to learn how to use the engine you choose. You choose the engine that you adapt better to. There is not such thing as 'the best engine' you can grab a 'bad looking engine' and create a great game and grab idk, Unreal and create a crappy game. The tool doesn't make the artist. The artist make the tool (or something like that :-P)
Good luck with your projects.