Some of my favourites right now:

-Wingspan: 1-5 player game about birds from all over the world (with the European, Oceania and Asia expansions). Build up your board of birds and make future actions you take have more effects. There's a solo mode and Asia expansion introduces a special 2 player and 6-7 player mode. As a birder myself, can't recommend this game enough.

-Parks: Small but in depth 1-5 player game about exploring US national parks. You buy gear and set your hikers off on a trail that changes every round, to collect tokens and visit national parks. Games last up to an hour that feels like it flies by. Box design is the best I've seen, everything just fits together perfectly in a tiny box, making it much easier for travel.

-Terraforming Mars: Most complex game I own, for 1-5 players. Games can take 2-4 hours sometimes. You play as a corporation and compete with others to terraform mars the fastest. You raise the three global parameters (temperature, oxygen level and water) and increase your terraforming rating, all while managing your resources by playing various project cards. Has a challenging 1 player mode where you're racing against the generation counter to terraform mars in under 14 generations. Expansions are a bit expensive but I can recommend Prelude and Hellas & Elysium, for extra cards that can be played at the start of game to kickstart your resource generation, and a double sided map you can use as a replacement for the base game board.

Other notable mentions are 7 Wonders, Tokaido, Mystic Vale and Ticket to Ride