Study the Bible · Chase one word all the way down the hole
Follow the Rabbit
Scripture explains Scripture. When a word or phrase jumps off the page, that is a rabbit. Chase it. Search where else the Bible uses it and follow the trail from verse to verse until you can see what the whole Bible says about it. You will land in places you never would have gone on your own, and that is where the treasure is.
Other methods: S.O.A.P. · Observe · Interpret · Apply · Verse Map · Topical Recon · Character Study · Book Recon · Pray the Text