Your gut bacteria do not eat motivation. They eat what reaches them.
A lot of your food is digested before it reaches the large intestine. Some dietary fibre and resistant starch travel further. There, gut bacteria can use certain fibres and produce compounds such as short chain fatty acids. This is one reason prebiotic fibre is discussed in microbiome nutrition.
In an Indian diet, gut bacteria benefit from variety. Dal, chana, rajma, vegetables, fruits, oats, millets, seeds and fermented foods all bring different inputs. Eating the same refined foods daily gives the microbiome less to work with. A plate of white rice and potato is not the same as rice with sambar, beans, carrot, curd and salad.
Meals can include legumes, vegetables, whole fruit and other fibre-containing foods. Choose preparation and storage methods appropriate for each food; a supplement does not replace that range.
Do not jump suddenly into large prebiotic doses. Gas is often a sign that the change was too fast.