what is your long term plan? If all is well with the look, condition of fronts/carcasses and the configuration/layout....try to see if the fronts can be removed and get new drawer boxes and re-use the fronts/have new slides installed. This is not complex but there has to be something endearing about your setup to keep these products going another decade or more.

The drawers in our kitchen sound very similar to yours. I bought under drawer tracks that are intended for exactly this purpose. I bought them at rocklers, do a search on their website for drawer slides. I bought mine in the store and can't remember which item it was. I also haven't installed them yet, so I don't know if they'll even work.

Here is a link that might be useful: Rocklers Drawer Slides

French chalk would be another budget fix that doesn't leave so much of a residue as wax would.

I decided I wanted soft/self closing drawer glides to replace the 40yr old single track/little rollers that I had.
My drawers were too large also.
I priced new "boxes". WOW! I had no idea they were so expensive.
Next option was to buy the lumber and build new boxes myself.
What I ended up doing was carefull taking my existing boxes apart, making them smaller, and buying a sheet of lumber for the box bottoms.
I re-made them the same way they were built 40 yrs ago. While probably not made as well as new ones, They were still rock solid after 40yrs, and the design was simple enough for me to do, without buying new equipment/tools.
I didn't groove or notch anything (like I was told MUST be done).
Instead, I just measured, added, subtracted, divided, carried the nought, and repeated. Seems every drawer I had was just a bit different than the one before.
The "math" seemed insane.
It took me two whole days to destroy and rebuild 9 boxes, install KV glides, and get everything working properly and ready for paint.
The boxes are not built like everything I see when I search for new boxes...especially boxes for undermount glides.
The glides are not installed exactly as per the instructions (due to the box faces being installed last, and, there is no recessed bottom in my boxes, and no notch in the rear.
And, they work perfectly.

BUT, I found no way to do this without either having smaller boxes, or larger drawer openings in the cabinets.

Before I remodeled I had a 65 year old kitchen.

Ski wax worked great to make them slide again! You might want to try something simple first before a big project.

I've used the Rockler tape on our sticky kitchen drawers and it's fantastic. Been on about 2 years now with no issues. DH even put some on the big heavy drawers of tools in his wooden tool bench and they slide like glass. It's quite amazing and I highly recommend it. The price is right, too.

Here is a link that might be useful: nylon tape

That tape is pretty great.

I'd also do new boxes, actually.
I'd have to save, but I could also do a few at a time.
I'd also talk to Rockler about which slides would work best for your drawers. Undermount, center, side mount, etc.

Do you like your cabinets?
They're worth investing in?