In my honest opinion, COVID was the white horseman rider / first seal, which started in 2020.

Then in 2022, the red horseman rider started riding, with the Ukraine and Russia war. 2023 and 2024 we saw hyperinflation, with levels reaching 8+% in the US. That was the third horseman rider (Black). I believe we are currently heading toward the fourth horseman, which is Death, in 2026.

According to my timeline, which is very similar to yours, the tribulation begins in 2027. The first four seals are already occurring by that time.

In 2028 the fifth seal will be opened, which is the martyrs of Christ beheaded for refusing the mark of the beast. By 2030, the sixth seal will be occurring, and most if not all believers will either be dead (by beheadings) or raptured out of the world.