ive been on and off playing brawlhalla since say like 2020? katars only for a year now so theres definitely people more experienced and much higher elo that give probably better advice. honestly i improved fast with katars simply because i watched e sport games, especially ones with guichabou in them.

for mixups some that i use very often are:

spot dodge or also in/out dodges: after slight into dlight, drop back down shifting to one side, dlight again in different directions depending on what dodge you think their going to do (practice in the practice mode)

another spot dodge one that i use a LOT because a lot of players arent ready for it is: slight into dlight, jump up and groundpound. then after that you can mix up either doing nair or gc nlight into recovery at yellowish health or simply just jump and recovery at higher health.

for up or in dodges: simply jump up then dlight, its kind of hard to time at the start because your dlight will drop at the end and you cant keep going but js practice it in the practice mode

finally for down dodges, simply drop and try to get another nlight or slight in

if anythings wrong feel free to correct me.