Protein Sources

That's a pretty decent whack of protein, what's your protein goal?

What are your protein goals?

Lean meats - chicken breast, white fish, canned tuna, ground turkey, turkey breast, lean cuts of pork
Other stuff - Greek yogurt, tofu, seitan, tempeh, lentils, nuts, beans, peas, low-fat/skim milk, cottage cheese, nut butters, chia

I don't know your body size or goals, but that's an unusually big number, 243g daily. 40% is also an unusually big percent, and implies that at some point, you deliberately increased your protein goal to double MFP's default value. I'm not saying that's wrong, not at all. I'm only saying that I'm assuming you must've had a reason to go big, so would know why you made the choice that's now making it hard to hit that goal.

I'd note that there are sources out in the blogosphere that have protein recommendations in excess of what's needful, and there have been cases in the past where folks who've posted have ended up with a harder-to-hit protein goal than necessary as a consequence of following those. I'm not saying you did that, just that that past experience raises questions in my mind.

The commonest example, but not the only one, is people who get a "1g per pound bodyweight" (or more) recommendation from a bodybuilding source, then apply that in a context where they're substantially overweight and trying to lose weight. We don't need bunches of extra protein to maintain fat mass: I'm sure you know it's for maintaining lean mass. The problem isn't the "1g+ per pound" idea, necessarily, but rather that if substantially overweight it can reasonably be used by plugging a healthy goal weight into that rule of thumb instead of current excess-bodyfat weight. But that's an aside, may not apply to you.

In general, I encourage people to estimate protein in grams, then set the MFP percents based on that, rather than just using percents. In a calorie-counting context especially, any given percent could be inappropriate, whether making it tough to hit an unnecessarily high protein goal on reduced calories, or seriously lowballing protein because someone's cut calories silly-far.

If you'd like to consider an alternative source for protein goal recommendations, there is a research-based calculator here:

https://examine.com/guides/protein-intake/

That site is generally regarded as neutral and science-based. Among other things, they don't sell protein supplements. They sell nutritional research summaries, basically, so it's in their marketing interest to provide public content that's accurate.

The guide portion has been reorganized semi-recently, but when I last read the full guide there before that, they suggested that if someone is substantially overweight, it could be sensible to use a lower weight in the calculator, I'd say maybe healthy goal weight.

If you know your lean body mass from something more accurate than a BIA device (such as DEXA), there are rules of thumb for estimating protein needs base on LBM. There are exceptions, but IME it's somewhat unusual to see recommendations much above 1g daily per pound LBM.

Upthread, I linked a post here that I think is your best bet for increasing protein via food intake. Of course protein powders/bars are an option, but I can't advise you there. I don't find them tasty or satisfying, can hit my protein goal without them, so don't use them.

The only other thing I can suggest is reviewing your diary regularly, looking for things that bring quite a few calories, aren't commensurately important to you for satiety, other nutrition, or even happiness with your eating. Reduce those (frequency or portion size), substitute other foods you like that bring at least some protein.

Also, evaluate what you're eating as sides, beverages, breads, etc. There are things in every category with more protein than others in the same category. Adding small amounts by doing things like (random example) substituting quinoa for rice can add small bits of protein here and there that add up through the day. Some of those side sources are less complete in essential amino acid (EAA) terms, or less bioavailable, but they're not completely valueless. Varying them widely can somewhat compensate for EAA incompleteness, too.

Best wishes!