There are several options. Some people find it on dedicated comic websites. Another possibility is to check out apps specifically designed for comic reading. But make sure to use legal and authorized sources.
The Solo Leveling comic is indeed finished. It had a definite ending that concluded the various plot elements and character developments. Many readers are still discussing and cherishing it even after the finish.
There are also some official websites of the publisher or the author that might provide the option to read the 'Solo Leveling' novel. However, make sure to access only legal and authorized sources to support the creators and avoid any copyright issues.
There are several options. You could look on platforms such as KissManga or Manganelo. But keep in mind that the legality of some of these sites can be questionable. Another option is to check if your local bookstore has physical or digital copies for sale.