Tropical glaciers can be found (or could once have been found) not far from the equator in Papua: Ngga Pulu, just under 16,000 feet high, sports an ice cap.

As for the steepest elevation, 30,000 feet may not be completely realistic but you might take inspiration from Mt Thor, Canada, the steepest vertical drop on Earth at 4,101 feet:

The cliff was created by glacial erosion scouring a steep wall as it formed the adjacent valley. The cliff's angled at 105° or more vertical than vertical!

To get your 30,000 feet you'll have to do some planetary engineering: lower gravity to start. See: What is the highest possible mountain on an Earth-like world?.

Tropical glaciers can be found (or could once have been found) not far from the equator in Papua: Ngga Pulu, just under 16,000 feet high, sports an ice cap.

As for the steepest elevation, 30,000 feet may not be completely realistic but you might take inspiration from Mt Thor, Canada, the steepest vertical drop on Earth at 4,101 feet:

The cliff was created by glacial erosion scouring a steep wall as it formed the adjacent valley. The cliff's angled at 105° or more vertical than vertical!

To get your 30,000 feet you'll have to do some planetary engineering: lower gravity to start. See: What is the highest possible mountain on an Earth-like world?.

Further thoughts:

Getting glaciers eroding valleys to sea level in the tropics will prove difficult, so your likely options here are:

1. The cliff was eroded long before the continent it's attached to migrated to the tropics; or

2. The erosion took place during an icehouse phase; the melting of all that ice raised sea levels so high the valley flooded and joined the open ocean; and/or

3. The cliff is on the continental-mainland-facing side of an island arc in a back-arc basin; it eroded just before the basin opened.

Tropical glaciers can be found (or could once have been found) not far from the equator in Papua: Ngga Pulu, just under 16,000 feet high, sports an ice cap.

As for the steepest elevation, 30,000 feet may not be completely realistic but you might take inspiration from Mt Thor, Canada, the steepest vertical drop on Earth at 4,101 feet:

The cliff was created by glacial erosion scouring a steep wall as it formed the adjacent valley. The cliff's angled at 105° or more vertical than vertical!

Tropical glaciers can be found (or could once have been found) not far from the equator in Papua: Ngga Pulu, just under 16,000 feet high, sports an ice cap.

As for the steepest elevation, 30,000 feet may not be completely realistic but you might take inspiration from Mt Thor, Canada, the steepest vertical drop on Earth at 4,101 feet:

The cliff was created by glacial erosion scouring a steep wall as it formed the adjacent valley. The cliff's angled at 105° or more vertical than vertical!

To get your 30,000 feet you'll have to do some planetary engineering: lower gravity to start. See: What is the highest possible mountain on an Earth-like world?.