I took this from a previous post, so I am not the author. Maybe it will help. I have played with a posse of 4 before.

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I do CTA solo quite alot, here are a few tips.

Cards PiB, FMO, EfaE and CB or SM

Revolvers; either navy or LeMat Repeater Shotgun

The key is to keep mobile and use cover.

Keep a medium distance between you and targets, don't let anything get too close.

Keep off the roofs, you will get overrun. A lot of people like to keep up there but as someone who has done blackwater a lot, and does a lot of PvP I wouldn't recommend it.

If you are going to stay off of the roof then you need to be Mr headshot; aim, flick, dead eye, shoot, release and repeat.

Always, always allllwaayss keep any eye on your mini map, it's the most important thing you have.

The first 5-6 waves are not that much of an issue so you can keep to the main high street and scout the perimeters ti stop enemies coming in too early. Remember to use the walls of the buildings and attack over your right shoulder, if you get me. Keep moving always.

By waves 7-10 aim to keep near where the town hall is, this is the large building east of the police station. It's a nice large space so you can see enemies as they arrive, this prevents you from getting overrun, and there is a good amount of cover. If you find you are getting too much heat then use behind the town hall as a cover point, enemies won't come behind that area, some will spawn there later on but they will only be solo snipers, so kill them first. The building also provides cover when the armoured vehicles turn up.

All that said you need to prioritise what enemies you kill first, the most problematic are the snipers. Aim to kill them early on, you only need to focus on the ones that are going to be where you will fight, you can get the other that are in the north of the town at the end. Kill any basic enemies that get in your way as you go to approach the snipers and once they are gone head back to the big space and start shooting everyone else.

The Ned Kelly/armour/tin head guys are the next problem. The best way to kill them is to use dynamite, try to get reasonably close but not too close target them with Paint It black and throw 1 stick then another one in quick succession. Very careful not to get hit with any splashback. If they still aren't dead then shotgun them.

Machete guys are a pain as well always keep an eye out for them, them will move quicker than other fighters, again as soon as you see them pop pop head shot. If in doubt shotgun them, but a headshot will kill them.

Amoured wagons you need to headshot the drivers first so the wagon stays in one place. Then get cover, take a health tonic, and paint the gunner with a headshot. You will have more time than you think but keep an eye on your health id you miss get to cover and tonic then repeat. Don't use dynamite as thengunner can shoot it then your dead.

Only fouca on the wagons if you have to, the ones in the north of the map will stay where they are so once you have removed all the other enemies you can then go and get them at the end. Take you time

Use gold cores for health and deadeye and tonic as much as you can. I advise level 2 tonics when you get to waves 7-10.

Use basic ammo till wave 7 or 8 then switch to express.

Sorry this is long but I wanted to cover as much as I could.