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Printing here with eSun PLA at 215 C on a Prusa Mini, and there are lots of hairline strings.
What's causing those strings? Temp too low?
Try dehydrateding your pla first. Then try some of these other suggestions. If all else fails, these clean up really nicely with a butane blow torch.
You already got a good answer about lowering temp and tuning retraction. Other than that, you have underextrusion there (gaps in the flat part on the build plate). I think you should extend your calibration:
Calibrate temp - flow - retraction
To reduce stringing you want:
Be careful with first two, if you go too far you might get a clog. Sometimes its just better to accept some stringing, but since you are at 215 I bet it can be improved quite easy
I can't add anything concerning stringing that the other comment didn't already cover, so I'll ask about the gaps.
Have you tried upping the flow rate to fill them in? The other option I've used in the past was lowering my Z Offset if the flow was alright.
Keep in mind that changing your flow rate will likely also cause you have to mess with your retraction settings again.
Haven't printed too much, so take my comment with a grain of salt. But I don't think the temperature is the problem. I notice that I get strings when I set my slicer to not do retraction. I guess that makes sense intuitively - strings are just plastic where they shouldn't be, and the best way to prevent that is to make sure to retract the plastic away from the print.
Also, I think 215 is slightly high, or at least higher than what I use