If you aim for having 300 skills, or having 50 million skill points, for example, those are just random numbers that don’t really make much sense.
You CAN, however, aim for “I want to fly cov-ops ships, I want to have maxed-out probing skills so I can find prey in under 30 seconds, I want to fly recons, T3 cruisers, logistics (healer) ships well enough to be renown for it in my fleet, I want to fly a carrier capital ship, I want to have a freighter to trade with, I want to have 300 market slots and the ability to change my orders from anywhere within the region, so I don’t have to dock at Jita,” and so on. More meaningful than 50 million skillpoints, though ultimately the skills that you need to train to unlock each of these ships will add up to some number of skillpoints.
But these are just goals to build your character / alts.
You can have “performance” goals instead. Be the top ranked on the killboards, or at least be “in the green” (more kills than deaths). Make x amount of ISK, or control the market for some region of space, or for some ship or gun or whatever niche you find. Manufacture enough ships to support a small corp or a large alliance.
Or you can have social goals, either for yourself or for your corp. Make a name for yourself, be nice to the newbies in some grand way, join EVE University and teach some classes, or write some guides. Form your own corp, and do something with it; take it to WH space or 0.0, take an area for yourself, build some citadels there, get into some wars, be a leader. Help your corp leaders move ships and gear around to the various bases of operations so they’re all ready for everyone to enjoy. Become the most successful spy / secret agent / nastiest pirate / most loathed awoxer or suicide ganker. Scam someone out of trillions of ISK.
EDIT: my goals over the years were:
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train for cov-ops, recons, ewar, and then logistic ships, because I like support roles. Make a skill plan and get it going, figure out approx. how long it would take
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try exploration, missions, do missions enough to get standings with a couple opposite corps, to get access to level 4 agents and locator agents
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find a corp out in 0.0, join them, move to their space, participate in their ops. Ended up helping out with moving fuel to their POSes and helping others move their loot to/from high-sec, and also participating in various fights / wars (that was fun).
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help others out by answering Newbie Q/A questions whenever possible.
Keep in mind that I started and abandoned multiple characters. Took year-long breaks from the game. Played on and off. It’s a long term game, and it’s a game, you can’t get more involved in it than RL allows (family, work, etc.).