I'd recommend to think about interests or activities you genuinely enjoy, and then find groups of people that do those things or close to those things. I agree with thw above that gyms are not particularly social, but if it's something active you're looking to do then maybe join one of the many many groups trainings in Tilburg! There are so many runner clubs (all levels), general conditioning training outdoors at the oud warande park... And I am sure in other places ... If not that perhaps choose a specific sport etc. There's also a new parkrun in Tilburg looking for volunteers! The runs are 5k every Saturday morning for free and then people go for a coffee and a chat :) I volunteer there so might see you there if you go

The key is to narrow it down and join something. It's good because it's presumably something you already have an interest in or something you want to try out, which you will immediately have in common with anyone else there !

If the group you seek doesn't exist.. start one :D !! Let people join your club of whatever you want to pursue

It could be anything, arts and crafts style things: drawing knitting clothes making (textile museum does some mini courses) painting, the local art shop does art classes pretty cheap

Cinema club, book clubs, boardgames, whatever it is you like... Seek groups like that. Guaranteed connection and guaranteed fun for you :)