how to make my alfalfa spots bigger in forest garden?

Hi, 2 years ago i started a forest garden. What i did basically is let everything to grow and also i planted some pionner trees. At this moment the land looks like a jungle , very chaotic with a lot of different plants and i discovered that a lot of these plants are edible.
I discovered in the land some spots of alfalfa growing scattered in the forest. But the spots are very small (now wide) and they dont expand, some of these spots had some purple flowers but now some of them doenst have the flowers and it seems they are getting dry ( around the spots are a lot of other plants) . The spots are small and im afraid of eating the leaves because they just have a few leaves, and im afraid it can affect negatively the plants, so i let them grow , but it seems they are not expanding and also it seems they are dissapearing.

Do anybody know how can i make my spots to get bigger? wider? Which is a good way to eat the leaves of alfalfa?

I want to produce a lot of leaves of alfalfa so i can eat them regularly withouth affecting the plant. any idea?

I am not experienced in this but from my research on this There are three things that may be happening.
Although a perennial it does decline with age. 3 years under poor conditions 12 years under ideal conditions.
It needs solitary bees like leaf cutter bees or alkali bees to set seed.
Wikipedia
says This plant exhibits autotoxicity, which means it is difficult for alfalfa seed to grow in existing stands of alfalfa.[6] Therefore, alfalfa fields are recommended to be rotated with other species (for example, corn or wheat) before reseeding.[7]

Therefore you may want to try seeding it in new areas. organic sprouting seed can be obtained at health food stores.
If you live in an area that has become a native bee desert you may want to purchase some leaf cutter bees. recommended source crown bees

My research into alfalfa as an edible lawn plant suggests there are bad side effects from eating the adult plant.
On the other hand, people around the world thrive eating things that are allegedly bad for you!
Do you have prior experience with this plant that you can share?