The one I am at regularly but not weekly makes a lulzy amount of money out of cans of coke and toasted sandwiches, if your licence will let you do hot snacks on the premises.
I know this is not what you asked, but it is the thing that is easy and people will drop a fiver on a toastie and a can when they won't drop thirty quid on a new box to add to the pile of shame. Air fryers and panini grills are cheap. Check your licence conditions and think about it.
The one I'm talking about also has a very decent gaming space that will fit six 4 foot by 6 foot tables. Plus obviously the store can store terrain etc. The reason I bring this up is they are very willing and keen to host small tourneys, or special game days if you can get enough mates together, and also they can run regular games night with pick up games. Again, these sell a lot of toasties, and also the longer you've got people in, the more semi-impulse purchases they will make. We all enjoy lunch. We will not leave the store for lunch if lunch is available there.
Let people organise pick up games through your Facebook page. People want to come to a place where they can actually get a game, so make it easy for people to find someone to play with.
If there's a college or similar large collection of youngsters nearby, reach out to their tabletop, D&D, animefag, scifi/fantasy and similar societies to offer to host them for game nights or book club or whatever else. The store needs footfall. No, it's not a charity, but likewise, people need to be in the store to actually buy things, and as a new store you need to become known as a place where people can meet likeminded fgts and buy stuff.
If any of your customers sell not terrible and not pure hentai artwork, offer to display some of it and sell it for them for a small handling fee. You get free shit for the walls until it sells and more local community links.
No fursuits for any reason.
There needs to be some time earmarked for old bastards/veterans/however you call them, but you also need to be pretty friendly to having slightly bigger kids come in with parents. Kids want shit and parents have wallets. Do NOT become the local unpaid babysitting spot for the seven to fifteen year old age group, though. Shut that shit down quickly. A particular night, or afternoon, or monthly session especially aimed at younger players just getting into tabletop shit can be a good moneyspinner, if you can get your most hygienic/least pedo regulars in to help with small pick up games and coaching etc. Obviously let the kids play with the store models and terrain.
If the kids have a good experience they will buy things. If the old bastards have a good experience they will buy things. Make the experience of being in the store good.
The smelly creep who never buys anything but hangs around a lot driving away the actual customers and annoying the fuck out of the staff is not a customer and should not be tolerated. You know the guy. Every FLGS has this guy. I quit my job in our then-local FLGS because this guy.