An alternative way of leveling at this point can be OSRS Gold achieved by buying gold ores in the Blast Furnace and smelting them into bars required to create Gold Bracelets. These will provide you with huge amounts of Crafting experience , and they can be later dissolved using High Alchemy for a small profits and more Magic experience.
As you are an Ultimate Ironman, your options are limited. One of the best options for this scenario is to visit Port Phasmatys and bulk buy soda Ash or buckets of sand. Following that, head to the furnace located near the port to melt the materials into molten glass to make glass-based products. Always aim for the highest tier item. You can boost the skill level to get maximum your experience. After crafting your items, make them available for sale in general stores and then switch worlds to replenish the store you purchased them from.
Farming Seaweeds. In the area that is underwater of Fossil Island, players are able to grow Seaweed Spores and plant them in their Seaweed Patches. When they do this they'll grow Giant Seaweeds. It is very profitable as one Giant Seaweed equals six smaller ones. Adventurers who want to use this method should look for Flippers they can get from Mogres at one-half of the ratio.
Spores required for planting can be obtained from restaurants, that are in close proximity Therefore, finding them should not be a problem. But, those wanting get rid of them need at least Brine Saber as well as Trident. The first is obtained from Old School RS Gold Brine Rats (that do require 48 Slayer) while the other can be obtained through Kraken boss, which needs at least 87 levels of Slayer skills.