One thing I do is to extend what you already do. So take a lick you already play/know. and alter some of the notes, or the note order. until you get something you like. Once you have the new lick, make sure to play the old lick, then make sure you can alternate each at will, so you can use the new lick as the alternative, but still use the old lick.
If you primarily use minor pentatonic shape/position 1, which is a good start for any line, add in the notes from the top 3 strings of shape/position 2,(used 1 position higher than your start position 1) and also the notes of the bottom 2 strings of shape/position 5 (at 1 position lower) . The aim is to have a diagonal group of notes, larger than shape/position 1, but not having to think too much about the whole of positions 2 & 5, you just know when you're on the high strings, you can go higher, ditto on the lower strings. Get comfortable over 6 fret spans, extended off the corners of position/shape 1. Get used to playing within the 6 fret 3 string area of each corner. Add in the rest of the adjacent positions, when you want to vary what you can already over position 1, and the 2 corners. If you play something you like the sound of, record it. I use a Zoom H2N, but previously a microcassette. It's so easy to remember a lick incorrectly, especially if it sounds 'unforgettable'.