Does he suggest one on one hangouts or only group plans?

Look at what the group invites have in common. If they're all things he's already doing with friends, like a regular game night, a sports league, or a bar he goes to every weekend, then he's including you in his life rather than building a plan around you. That's a reasonable sign of interest, just not a specific one. If the invites are for things he wouldn't otherwise do, like a new restaurant, a concert, or a festival, he's probably making an effort, and the group format is doing the work of reducing pressure on both of you.

Also notice how he talks about the event. Does he mention you by name, ask what you're into, or refer back to things you said? Or does the invite read like a mass message? Small details, like a joke that references a previous conversation, point to someone who is paying attention, even if he's keeping the first step in a group setting.

If you want one on one time, the most effective move is to propose something specific, time bounded, and low stakes. A coffee, a walk to a particular spot, or an early drink gives him an easy frame. Vague suggestions like "we should hang out sometimes" are easy to agree with and easy to forget. Tie the plan to something he has already mentioned liking, or to a place near where he lives or works, so he doesn't have to think about logistics.

You also have to be willing to hear no, or a not yet. Make the ask once, clearly, and let him respond on his own terms. If he says yes, you've learned he's open to it. If he says he's swamped but he'd love to do the group thing again, that's still information. Either way, you don't need to ask again in the same week.

Group events often end with a flurry of texts that goes quiet afterward. A few days of nothing after a group hangout is common and usually doesn't mean much. Give it until the next natural point of contact, which is often a few days to a week. If you've already made a solo suggestion and he hasn't responded, don't follow up with a second one right away. One follow up a few days later, lighter in tone, is enough. After that, let it sit.

If he keeps accepting group invites warmly but never engages with a direct proposal across several weeks, you have your answer on what he's comfortable with right now. You can keep enjoying the group settings, or decide the pace isn't what you're looking for. Either choice is reasonable, and neither requires you to keep pushing for a one on one he isn't offering.