Guada/ first time grower

Accidentally deleted a week so here we go again. This week the plant is looking really good! I've been just feeding her tap water (where I live the water is really good) and using coffee grounds, eggshells and I am going to start looking for other organic/natural (as well as relatively cheap) ways to feed her the nutrients needed. There is some slight yellowing in the top leaves but the newer stems look pretty healthy. I see a lot of little bugs, the coffee grounds seem to repel them a bit but I am wondering if there is another (again relatively easy and cheap) way to help keep critters away. I also burn palo santo frequently (I am indigenous and it's a sacred smell and habit of mine. I notice that the smoke keeps critters away as well. I've been reading about using volcanic ash (in small increments) as well as hydrogen peroxide (3% or less) and how it can help boost growth and keep away certain bugs. Any tips would be appreciated. Again, I am trying to grow as cheap as possible. Where my family is from it's grown wild and can be grown with little to no maintenance. Of course that will affect the potency but I believe there are other ways to increase it, spiritually, and organically etc.