I don't really get your point, especially the "i don't want to play against people who are clearly better than me". You named some of the best Apex players who can get 4k-20kills even in pred lobbys.
The secret to improve in apex legends is by facing stronger opponents. When we get killed, you have to understand that (except for few exceptions) it's mainly our fault. When you do so it's so important that you analize your mistakes and try your best to avoid them in the future. By facing stronger players you can ask yourself, what did i do wrong and what did they do right.
You said that "i can't have it because of my trash teammates and god enemys". Every time i get a 4k-20kills is by playing solo. If you have god teammates, they will yoink all the kills and farm your damage instead. You shouldn't be relying on your team to improve your gameplay.
We also have to mention that Apex Legends skill level has been rising alot since the game has been released and consistency is key. The people that you watch on youtube getting 5k and so on play and have been playing for a very long time, since for most of them is a "job". For them, you are the bot and they made it possibile by rising their skill level. Their mistake ratio come close to 0.
You can't pretend to face worse enemies as you can't pretend a completely even matchmaking. If the skill base level in matchmaking is flat, everyone would get a kill and then they would die.
This whole argument is very complex and has much more to add then "give me bot lobbies". We are no more in Season 1 where noone knew what to do and how, and pretending to get a lobby full of new players just to get your 20kills badge is kinda disrespectful. Your complain wouldn't make sense since they would want the same thing.
To conclude, i wish you the best of luck with your badges, and as i said, my advice is to fully analize your gameplay and your mistakes (positioning, when and how to push, who and when you should engage, 3rd-4th-andsoon-party analisis, fight duration, map rotation, end-zone gameplay, weapons and legends meta, and much more) instead of waiting to get worse enemies. PEACE