Sometimes using a longer lens aids with in-camera composition and focus, but if that's not a problem than there are PP solutions available. The example shown is a 4000x3000 pixel sooc jpg and an enlargement 10000x7500 pixels cropped to 4000x3000 pixels. On1 resize was used for 2.5X resize. I see no noticeable loss in resolution nor noise increase.
2.5 up-size cropped to 4000X3000 pixels
PSE 18, On1 Photo RAW 19, Image Composite Editor, Windows 10
Great example Peter. I shot with a 300-mm lens for years and often upsized for printing. Was okay. I've since purchased longer lenses and love them, but as Helen noted, they are heavy. So far, I can still schlep the big one around.
Software, cameras and lenses: we are blessed with fabulous technology!
Sony A7III FF mirrorless, Sony FE 200-600mm f/5.6-6.3 G OSS lens, FE 24mm F1.4 GM lens, Sony FE 24-105mm f/4 G OSS, 70-400G, 70-300G, Sony A77 APS-C, Sony 16-80 CZ, Minolta 100 macro. Currently using PSE 2018, but had PSE 11, 10, 8, 6 and 3; PS LE and full PS.
A couple of years ago, I purchased a 150 - 600 mm lens that weighs 4 lbs. I got it mainly to photograph the moon, Jupiter, and to take on short hikes where my 300 mm lens couldn't reach far enough. I use a DX format camera (1.5 crop factor) so the lens is equivalent to 225 - 900 mm. I wouldn't want to carry it on a several hour excursion, but it has come in handy for certain things. So I guess it depends on what you want to photograph. Your grasshopper photo looks very good cropped.