[etc] Help me choose a lip filler hospital!

I'm thinking of dissolving the ones I had before and getting lip fillers again in a year. Is the Botox effect on the corners of my mouth okay? Since a few days ago, the corners of my mouth have seemed to be a bit droopy, so I keep looking at them and paying attention to them. Also, isn't it difficult to get a lip shape you like with filler? Looking at this too, it seems like there are a lot of cases where people just melt and add and repeat and then just return to their original lips. Also, just look at the places that have a lot of reviews of places that are good at fillers? Or, do you have your own criteria? Can you share what you look at when deciding where to find the right fit?