This is a wonderful question, but the answer has to start from response to another question, what do you want to do in your life ? Career Life is a trip, it has a beginning and many time humans do not think about when it end and how it will end.
So when you are planning to retire and what are the triggers for this ? only when this answer is clear a prober answer can be given. however, i would recommend to go for any of the following: 1) selling goods on e-commerce platforms. 2) making your photos and selling them if you like to. 3) explore minting NFTs. 4) ensure investing a portion of your income to start generating passive income. Hope this will help.