>>1767259OP, mileage numbers don't mean much on their own - what matters is the quality of your rides. I've met plenty of folks who are into touring at a slow pace or puttering about on cruiser bikes who put incredible amounts of time into riding and cover lots of miles, but they're not very strong riders. And conversely, I know some very strong MTB riders who don't cover all that much distance in absolute terms compared to someone who's only into road cycling.
And the amount of distance you should aim for personally is something that depends on your training and what you're aiming for - if you're into randonneuring or want to do epic length gravel events then you'll want to go for longer indurance-training rides than someone training for criterium racing. Also, interval training is very useful if you want to become a stronger rider, and that's something that's largely independent of the distance you cover on a bike.
