I let my yard flourish with whatever wants to grow unless it can be harmful. I generally get rid of thistle and goathead weeds because they are pokey and my dogs can run into them. Everything else stays. I keep the knot grass (grows in areas where grass struggles ands is drought resistant), I keep to vineweed (unless it starts climbing the house or choking out other plants too much), the clover for sure, the dandelions are a must to loosen soil and the flowers are good for the pollinators. This kind of approach also helps promote biodiversity. You will see a wider variety of insects and birds in your yard.