This is one of my favorite verses:
Rev 6:10 (ESV): They cried out with a loud voice, “O Sovereign Lord, holy and true, how long before you will judge and avenge our blood on those who dwell on the earth?”
“Those who dwell on the earth” are provably unbelievers. One of the best examples of that is:
Rev 11:10 (ESV): and those who dwell on the earth will rejoice over them and make merry and exchange presents, because these two prophets had been a torment to those who dwell on the earth.
In Rev 6:10 (above), who are those crying out? They are new converts in the Trib. They are a product of the 144k who evangelize and save a multitude, in the Trib. In Rev 7, their tremendous achievement is celebrated.
Rev 6:11 makes clear that there will be two groups of martyrs that will make up the GM (great multitude), found in Rev 7:9-17.
The martyrs in Rev 6:10 are the first group of martyrs from seals 2 and 4. There’s devastating carnage in both. The second group (cited as “fellow servants” in Rev 6:11), are found in Rev 20:4. In the last sentence of Rev 20:4, all of these martyrs are resurrected. They appear next in Heaven, in Rev 7:9-17.
It’s definitive that no believers will enter the Trib.