Doing the exact opposite might help — probiotics feed harmful bacteria as well and a different strategy would be to simply try to keep your microbiome as basic and unintrusive as possible, allowing the gut to calm and heal.
It’s easier said than done; recommend looking into natural antibiotics (eg cooked white button mushrooms), indigestible fibre to ensure regular movements, which more than anything lowers endotoxin load (raw carrot salad), carbs from sugars instead of starch, which get absorbed more quickly and won’t be very “prebiotic” (eg ripe oranges, honey) and nutrient dense foods to meet metrics (organ meats and cheeses).
Probiotics do not feed bacteria, they are bacteria. SCFAs, butyrate, etc. are critical components for overall health, and especially in colon health and the normal functioning of apoptosis and other mechanisms. Prebiotic plant fiber feeds the healthy bacteria which produce those. Eating WFPB helps the healthy bacteria thrive and starve out the bad ones. Trying to intentionally repress the entire microbiome is a recipe for creating an opening for unhealthy bacteria to take over, while also depriving the body of healthy microbiome byproducts.
I doubt that it's possible to target "healthy bacteria" with diet prebiotic plant fiber (probiotics are bacteria and won't "feed", you're right) -- it's random, unfortunately.
Low endotoxin load > health effects of butyrate etc, if you have serious issues like IBS or crohns
It’s easier said than done; recommend looking into natural antibiotics (eg cooked white button mushrooms), indigestible fibre to ensure regular movements, which more than anything lowers endotoxin load (raw carrot salad), carbs from sugars instead of starch, which get absorbed more quickly and won’t be very “prebiotic” (eg ripe oranges, honey) and nutrient dense foods to meet metrics (organ meats and cheeses).