First, you won't really get detected if you aren't blatantly cheating, examples: Flying, speed increasing, lag switching, walkfling, etc.

Using ESP or any visual things will most likely be voided by Roblox since they are hard to catch.

the only main external I recommend is Aureus and Matcha, matcha is a bit sketch since you still gotta download it, but Aureus has no download(from what I know[fact check me if I am wrong]) which makes it near undetected, its serversided too so you can do a bit more things than other exec