Well, there are always different ways. Is there a story in your life that you can tell better than anyone else? Do you have unique or unusual expertise, experiences or a way of looking at things differently that other people might be interested in? Do you ever play a game, watch a film, listen to music, read a book etc. and think "well, this would be better if they did it this way?" Get inspiration from varied sources. Above all, you should be trying to make the game that you would want to play. If you do that, other people will want to play it to.
Some more ideas:
Try to make as many small games as possible and look for chances to do things differently. One idea usually leads to another.
Take inspiration from the coding process. I’m pretty sure Baba is You was written like that.
Same with the creative process. A lot of what’s unique about our games comes from the necessity of problem solving (e.g. having no budget for graphics resulted in me editing Deviant Art stock photos, taking photos from a castle for backgrounds, and making real life props.
If you make enough games, maybe ideas will come to you in your dreams (sounds like a long shot, but Paul McCartney wrote ‘Yesterday’ from a dream, so you never know). Keep a journal just in case!
On the subject of music, Radiohead wrote a whole album by picking words at random. You could try something like that.
Get someone else to bounce ideas off. You’re already asking the itchio forum, so that’s a good start.
Maybe meditate or just give yourself thinking time with no distractions. Giving your mind time to wander is an excellent way to get ideas.
Do something similar but with a pen and paper. Writing automatically in a relaxed state is likely to result in a load of crap, but also some gems.
Try and shake things up creatively- watch TV programmes and films you’d never watch, listen to music you’d never usually listen to etc. Even if it’s considered trash, it could inspire you and get you thinking differently.
Regularly play new , random or striking games on itchio and/ or watch streamers who play weird indie games or dev streams. You’ll get a load of ideas.
Alternatively, just mesh about 3 entirely separate games together and you'll come up with something more original than most AAAs.
Hopefully, at least some of this will be useful to you!