I'm sure you can get creative, seeing how these Gods are no longer a coherent religion, but romanticized relics of the past.
An idea would be to look into what other people who worship a certain god/dess do. If you'd like something handy and quick to orient yourself how to honor a god, here's a fantastic blog that has handy cheat sheet guides how to approach every Olympian god
and more minor deities. It's got interesting details but is still concise.
https://screeching-0wl.tumblr.com/post/666952242338856960/hellenic-cheat-sheetsPicrel is an example sheet on Artemis from the same blog. Devotional acts are, I assume, the best way to show worship. Fortunately, this doubles as self-improvement in the name of your god or goddess, so you can't lose even if you abandon your interest in Greek deities. May you pick the most suited patron for what's best in your interest. Best of luck anon!