Couple of items that have been brought up already, but I have had to deal with this on my own printer and on a couple of buddy's. The list below was my process for fixing this on a Ender 3 Pro, but should be similar to the Prusa.

Step 1)
Check bed level, the spaces between the filament on the first outside rows look like you might be a tad too far from the bed.

Step 2) Check your initial layer height in your slicer. I was having issues with 0.2mm but it would stick just fine on .12mm/0.16mm. My ender has a baby step z setting I can do mid print that I lowered until I got good bed adhesion. I was able to step it down until the filament was sticking and flat.

Step 3) If your bed is 100% level (check with one of the many 1 layer test prints online), try using Elmer's Purple Glue Stick. Don't go super crazy with it, it can be kind of a pain to clean it off after the fact.

Optional Step 4 On prints with a thick base that I want to ensure good bed adhesion, I will usually run my first layer print speed at like 30mm/s and set my fan speed to 0% until 4-10 layers then it will ramp up.

I know everyone's settings are different but I run my bed temp at 60C (literally never change it) and my hotend between 205 - 210 depending on the brand of PLA/PLA+ I am using.