You have more than one option on paint. On this frame, matching a touch up paint is best. The original paint does not look bad, and some paint wear is typical on a vintage frame. Just touch up the bad spots. Testors or nail polish work well.
Rattlecan paint jobs are pretty much total disasters. They look good for a bit, but rarely adhere well and look like crap in a short time. Avoid. Rarely worth the effort and time.
You can get the frame powdercoated. This is one of the most durable paint jobs you can get. Cost usually around 150$. Good for beaters, etc.
For a higher end vintage frame, a decent professional refurbish is the way to go, but you will not get your money back on resale. I recently had the below Viner redone and I probably spent more than the bike is worth, but I like the bike and the respray is respectfull. This can be costly, from 300-1,000 and up.
You have a french bike and at that vintage, it will require french parts in the headset and bottom bracket. Looks like your frame has them, so problem out of the way, but matching spindles and cranks on these can be an issue you should be aware of. It can get tricky, or you can get the Velo Orange bottom brackets...
"It's always darkest right before it goes completely black"
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