I've seen some brilliant macros by the photographer reversing the lens on the mount. Some of the best i've seen was with an old Pentax 28mm reversed. I wish i could find the guy again.
I've tried extension tubes, but the resulting lack of light can be a problem, as can screw on filters with them putting extra glass in the pathway.
I know prime macros are expensive, perhaps not so bad 2nd hand , but they really are the best. Shot this pic with a 60mm f2.8 Nikkor AF Micro
1 photo to show uncropped Mantis and and another cropped down to show Mantis close up
NIKON D610+Nikon D7000+Tamron 150-600 G2+Tamron 70-300 VC+Tamron SP 90 AF Macro+Nikkor 28-105 AFD+Tokina 11-16+Manfrotto+Giottos