That’s awesome! I got back into LEGO as an adult in 2012 when they released the first VW camper.

On mine that panel seems pretty secure, though it is a bit finicky to attach. Might want to check if it’s properly attached.

Recommendations are tough; LEGO makes so many awesome sets. It also depends on things like budget and space. For example, the Concorde set is awesome, but also quite large.

Personally, I really like their modular sets. Larger, very detailed buildings like a hotel, jazz club, bank, etc. I’ve collected most of them so far.

There’s also a lot of cool new soace sets, in addition to the galaxy that you’re familiar with. I’m really looking forward to the lunar rover that’s coming out later this year.

A good site to follow for LEGO news is Brickset.com. That way you can get a feeling for any future sets that you might like. Some can sell out pretty quickly; lots of us adults love LEGO ;-)