The thing with scales is to make practice interesting. For example choose any given scale and play around just with those notes for 5/10 minutes - maybe think of a style to play in (Loud Rock, Funk, Blues, Pastoral - or an image, such as Dawn, The Rush Hour, and rhythms that may seem appropriate to those images
1. Make up some 4 note phrases - see what the different ones sound like (with C major you might try CEGB, then CEGA, then CEGF then CEAG, and so on. Then put them together into 12 note or 16 note phrases)
2. Practice all scales from top to bottom, and back.
3. If you have a metronome/or something which can to backing/rhythm, just put it on and play around with notes of a particular scale - long notes, fast notes.
4. With my main teacher we would start each practice with an improvised duet using a chosen scale, or take it in turns to play alternately. I wish that these were the things that were written down in a book about making practice creative so that players put in the hard yards out of interest, rather than a sense of duty. There may be, I may not have done my research. In this regard some of Jamey Aebersold's stuff bores me rigid - I just don't have Obsessive Compulsive Personality Disorder
There are endless possibilities so you don't just get stuck/bored playing the same notes up and then down for an octave or more. As Nick said it does take graft, but that means time rather than just repeated doses of something you don't find enjoyable.
Kind regards
Tom😎