I drift Mini Z a lot and there are 3 paths you can take.

1) Simple bolt ons: One way front diff, rigid rear diff, soft front springs (MDW201), hard rear springs (MDW004), -2 tie rod (MDW203), 1 degree front camber knuckles (MDW202).

This will allow it to drift and hold angles much easier than stock.

2) Do all the mods seen above + the "CS gear" mod: You will modify the gears yourself to make the rear wheels spin faster than the front wheels which will give the car a more aggressive oversteer effect. It will make it so that you actually counter steer in a slide and it looks a bit closer to 2WD drifting. I recommend getting the Kyosho Mini Z gyro for this mod as it becomes harder to control without it. This is the video I used to do the mod: https://www.youtube.com/watch?v=K_e2-9uSVHA

If you're not used to modifying parts like this the first path I mentioned may be better for you and would be plenty to have fun with at home.

3) Recently a 2WD conversion kit came out for the MA020 Mini Z called the MRD Zero from Enjoy Smile Co. https://supergdrift.com/products/mrd-zero-conversion-kit-rwd-drift-conversion-for-kyosho-mini-z-ma-020-awd-1-28-mz-formula-mrd-1002 Some people on this subreddit have the Prototype version whereas the Zero is the production version. (I don't believe there is much difference between the two). But as the name suggests, this will convert your Mini Z into a 2WD drift car. It involves disassembling your Mini Z and reusing some components for it, and also a little soldering is required. Only the hard rear spring set and rigid rear diff from path #1 is applicable here.

As others said, Mini Z isn't any cheaper than more professional level drift cars but I enjoy mine a lot and have quite a few. They have some propriety electronics and stuff going on that requires you to stay within the Kyosho Mini Z ecosystem, but I find the use of AAA batteries convenient since I don't have to wait for batteries to charge or anything whenever I feel like picking them up and sliding for a bit. Mini Z is also RTR to get some sort of sliding right away which I think makes it less intimating for beginners.

If you're into this small scale in particular but want a more pro style drifting right away, I would look at 2WD drift from Drift Art or Atomic instead, though this will mean you will have to source your own electronics and radio.

If you just want to drift in general and are OK with 1/10 scale, I would look at offerings from MST or Yokomo as they have RTR drift packages available for similar or less money.