Hello and welcome to the forum! I would suggest that you do as much research as you can before you purchase a parrotlet, especially since you have other birds. And of course, we are happy to help you if you have any questions or concerns. Good luck and let us know on what you decide!
Hello, welcome! A little budgie was my first pet as a child, I have parrotlets now (oops correction I have parrotlet two of mine passed still not used to it) and I have 2 bourke parakeets. You get in the groove with multiples and every birdy gets a "habit" that's manageable even if they don't get along LOL
My parrotlet is the boss and my bourks just run away if she gets too close, but I can have these three out at the same time supervised.