If your kickstarter fails, you still can explore other monetization options.
Regardless of what option you take, it is possible people are just not gonna care about your game or won't like it - there's no way around that. Most people on itch.io do not earn a living wage with their games, if they earn anything at all. It's a crowded marketplace.
My personal impression is that it is very unlikely to hit the jackpot and go full-time with your first game, no matter if it is funded via Patreon, Kickstarter or IAP. Starting as a side gig and transitioning to full time if you get lucky enough to find funding or get a surprise hit seems to be far more common.