I’ve tried a couple of “games” like FSEconomy I believe, but although I thought I wanted goals, it turns out I don’t, particularly. A friend tried to get me into something he was playing but it sounded too restrictive to me, like e.g. being penalised just for not switching off landing lights at exactly 10,000ft. As if a real pilot would be penalised for that!
Any time I want a challenge I just fly into or out of Heathrow on VATSIM during a busy period. :)
As for third party stuff, for now I’m just using the A32NX and the modded DA62. I’m not against paying for aircraft, especially since MSFS is so achingly pretty that I can’t imagine ever buying scenery. But nothing that has been released yet has taken my fancy - which is to be expected since the sim is still new.
As soon as someone releases a decent Boeing I will be all over it, no matter the price. I’m still bitter and angry to this day that the 747 is not flyable. The A32NX is great but I’m a Boeing fanboy.