While I generally agree with what SirSnookalot says here, I would add a caveat. The fish - E.g. bass, are almost always biting something somewhere. Tournament fishing has taught me that. You have got to constantly experiment with lures, colors, presentations, depths, cover types and/or locations until you find a pattern that is producing. There is almost always a pattern that is producing somewhere...
I can't tell you how many times during tournaments we've struggled, trying a variety of things, only to come across another competitor that tried something we didn't and stomped us at weigh-in... I've been on the other side of that equation too. Figuring out a pattern that no one else was on. When you do that, it is often lights out for the competition, and it feels great!
The point I'm ultimately trying to make here is that even though SirSnookalot's overarching theme to his comments - "Sometimes the fish just aren't biting", does apply in rare cases, I'd say it isn't applicable 98% of the time. In other words, Don't Give Up! I know that it can get tiresome when you are beating your brains out, tying on 20 different lures, running to different spots, all in 100 degree heat (I.e. down here in Central Florida), but if you truly want to be successful, you gotta do it. No excuses.
My rule of thumb these days is if I haven't gotten a nibble in ~20 casts, I need to change it up somehow - could be a different color, lure, depth, cover type, etc... After re-reading your initial post, it is going to be tough for you on a paddleboard, but that doesn't mean you shouldn't.
More experience will help you tremendously. More 'good' experience translates to doing the painful stuff I stated above. You'll figure out producing patterns faster with additional experience. The learning curve is daunting, but that is what makes it fun and worthwhile.
Consistently catching quality bass is very difficult. I don't care what anyone says.