Of course it's important to maintain outreach and hone in on one service, but I think Jimmy's advice on upselling/offering different things to clients can really help too.
It's only small, but just sold my client a new website for €550 after 3 months of working together, arguably could've charged more but I'm happy with what I have. It'll be pretty basic so should only take a few hours too with a template + AI.
This sale didn't take any long calls or convincing. We had a little bit of a strategic meeting, I just mentioned how we could upgrade and add some new features with a new website, along with how it could help improve/compliment our current Meta Ads, and he was happy to go ahead.