Hi Max
I have recently taken up running again after a 20+ years lay off. However, in this time I have still swam (swum??) on a regular basis and cycled a great deal (I have to I cannot drive!!) so my fitness hasn’t suffered too much apart from suffering a heart attack and 6 years later having a stent inserted!!!!! I, personally, don’t get too hung up on times or distance I just go out, run, and enjoy the experience. However, I do appreciate the desire of some runners to get faster or run further or both. Not being an expert on times I would think that someone getting back into the swing can be very pleased with your 5k time.
Welcome to the forum, everyone here is very helpful and they are all a nice bunch of people

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swim, cycle, run, sit down and have a cuppa