There is one technique I've learned recently that helps me in exploring deeply, releasing myself from preconceptions -- thinking in new ways.
This technique is called "make 50 of something" and to do it you make 50 of something -- in one big marathon. Not a joke. Take something simple that you do know and do it in 50 different ways.
This is different, say like you're trying to make new habits and have time to think between things. Most creatives and artists use this technique and I've started using it in the new programming challenges I take online.
Fifty is a lot of programs, even if many are just 1 to 5 lines. It's an intense exercise. The first 20 or so are fairly normal programming exercises. But 50 is a LOT, and things start to get weird.
It takes you on this weird journey of ups and downs and complexifying and simplifying and combining and taking apart. It can be oddly emotional and intense. It gets at something and teaches me something that is hard to find if I space things out or wait for inspiration.
Setting constraints can be liberating and I am looking forward to applying the same technique in my writing and see where it would take me.