HP printer can't print properly in colour - even with a brand new tricolour cartridge

My HP Officejet J4680 printer has started to have issues printing in colour, with very feint colours and streaks running through the prints. Black seems to be fine.

See here for an example of how the test and alignment pages are showing up: https://imgur.com/a/GBuYCMv

Things I've tried doing to fix it:

• Resetting the printer

• Installing a new ink cartridge

• Reinserting both cartridges

• Running a clean and alignment cycle

• Reinstalling printer drivers

• Cleaning the printheads with a q-tip

It's an old printer, so I suppose that I'm just SOL and need to replace it? (Though it's still annoying to deal with given that I just spent ~$50 on a new ink cartridge and this seems to be a very common point of failure for this model based on my googling).

Any thoughts on whether this can be fixed?