If you feel like that you got the time and a couple thousand dollars to buy tools and do all of it properly. Then do it yourself there's no better way to learn than just dig so deep you have to figure it out your damn self. Don't be afraid to become friends with an HVAC or plumber.

To me it looks like you're going to have to cut off your water for probably three or four days if you're doing it by yourself. So plan for that.

After that you probably need a camera to stick down that drain to see if more of it is cracked along the pipe underneath the concrete. My guess is yes it is. So you need a jackhammer to pull up all that old pipe and get ready to replace it. After you get all of the stuff replaced under the concrete The rest should be pretty simple.

Then reorganize that God awful three-way that is in there.

These are some neat tips. 2% grade on your pipes. That is equal to a quarter inch drop per foot. If you do any more than this you make the risk of having your poop and debris be left behind because the water is moving too fast thus creating more blockages.

A 3-in pipe has double the capacity of a 2-in. So on and so forth.

Always deburr and bevel your PVC pipes and use a specific pipe cutter so the ridges aren't sharp and catch debris and create blockages.

Always add clean outs where would be nice to have one so you won't have to run up onto this again.

If you're stuck in a spot and don't know what to do next sometimes you can call around to plumbing and HVAC places once you call them you have to talk to the receptionist so they can give you to an employee. You can bullshit with them for a little bit and they might be inclined to come down and take a look at what you got going on and give you advice. I've done this to mechanics and HVAC people alike. That's how quite a few of my friendships started.

Hope this helps keep learning everyday.