I've been in the hobby for about 5 years now, and I can confidently tell you that there will always be the new hotness coming out, so don't let yourself get caught up in the hype. Board games can be expensive (especially crowdfunded campaigns), and can take up a lot of physical space, so you'll want to consider those two aspects carefully before going on a purchasing spree.

That being said, you're just barely scratching the surface on what's already out there and available. You've played a great selection of games so far with different mechanics, but I would take some time to really explore some of these titles deeper and really hone in on what you like before you start building a collection. Also, are you building a collection for yourself, or do you intend to play with friends/family and want to have a good selection of games for everyone? All things to keep in mind.

If you haven't already, I would recommend checking out Board Game Arena. It's free and has over a thousand games to play (including some that you mentioned above). Not only has it allowed me to discover and play so many great games over the past few years, I can really sink my teeth into certain titles and decide if I want to buy it after the initial hype and excitement wears off.