Group feels exhausting to DM for
So i have some issues and i hope i might get some advice on how i might proceed as i have no idea how i might change things and i have no experience outside of this group
This group of friends introduced me to ttrpgs 3.5 years ago and i have become the de facto DM for nearly two of those years. But at the table it gets really tiring extremely fast.
This is a group of 4 players with one rotating in and out for personal reasons and i struggle to handle all of them, so i'll go and describe those.
First are the most invested of the group, two guys that are as they say "into hyper rp", meaning for the 1 always asking why his character would be interested in the world outside of his self profit and not giving a toss about how the team thinks (standing outside of a difficult combat because his character has an honour rule, trying to sell the hostages back to the bbeg the group rescued the session after, always creating selfish evil characters which he finds more interesting), in general he creates tension inside the team and works really bad with 2 who tends to create characters with ironclad good values and gigantic backstories though he does not hesitate to argue about them for 30 min+ of the sessions (not looting corpses of innocents and what constitutes an innocent). These two just tend to go at it with big arguments forever and whenever i interupt them to let others intervene or because it doesn't look like rp anymore at some points, they get together and say all is well and it's just in character.
3 is the opposite, most of the time they engage exclusively with the mechanical aspect of the game and tend to get silently annoyed when too much rp happens (taking out their phone, stopping interacting for the rest of the session) and exceptionallyvrarely they get energy and become the best rper of the table in the fun way. They tend to not follow the plot at all, being surprised by recurring information or thing that were said 5 minutes earlier. I always wonder if they even enjoy being at the table, I have talked to them in depth about what i could do to help them get invested and they always answer that they're already extremely invested and they do not know how i might help.
4 is great, invested, always ready for fun tactics. Though not a big rp person they always describing what their charcter is doing,the jist of what they say and are happy to roll. But they play their characters like a chaotic chimpanzee. Meet a king ? Planning murder 1s later. Explore a forest ? Burn that forest. Sneaking past bandits ? Charge in promising ignoble violent things to their kids. I talked about this with him and he just doesn't like how stagnant the decision making is and does thing before it sets in.
I think i am reaching the end of my reserves with these guys and it's been arranged that this campaign will be paused and one of them will replace me and i'll rejoin the group as a player but i intend to pick it back up with them enventually, What would you advise me to do to smooth thing out when that happens.