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Have a limited attack surface will reduce exposure.
If, say, the only thing that you're exposing is, oh, say, a Wireguard VPN, then unless there's a misconfiguration or remotely-exploitable bug in Wireguard, then you're fine regarding random people running exploit scanners.
I'm not too worried about stuff like (vanilla) Apache, OpenSSH, Wireguard, stuff like that, the "big" stuff that have a lot of eyes on them. I'd be a lot more dubious about niche stuff that some guy just threw together.
To put perspective on this, you gotta remember that most software that people run isn't run in a sandbox. It can phone home. Games on Steam. If your Web browser has bugs, it's got a lot of sites that might attack it. Plugins for that Web browser. Some guy's open-source project. That's a potential vector too. Sure, some random script kiddy running an exploit scanner is a potential risk, but my bet is that if you look at the actual number of compromises via that route, it's probably rather lower than plain old malware.
It's good to be aware of what you're doing when you expose the Internet to something, but also to keep perspective. A lot of people out there run services exposed to the Internet every day; they need to do so to make things work.