Do you use 100% of that lawn? You could mow only part of it. E.g. simple things like instead of using square corners, leave the coreners as-is with a radius of

Do you use 100% of that lawn? You could mow only part of it. E.g. simple things like instead of using square corners, leave the coreners as-is with a radius of a couple of meter and only mow those twice a year or so. Makes it also interesting to see the difference in what will grow. On the other hand if you keep on using pesticides it might simply not work. Why exactly do you use the pesticides? As other commenters mention, it's not normally a prerequisite to get a nice lawn.