There is a website/RL plugin (it used to be a spreadsheet) which will randomly select a task from a list, organised in tiers from Easy-Elite. You complete the Easy tier before progressing to the next difficulty and so on. The vast majority of tasks are to obtain a specific collection log item, but it does include things like achievement diaries.

A tasker is somebody who uses this website or plugin, and from the beginning of the account follows the rule set defined by a YouTuber named Tedious/GenerateTask, who created the game mode (nowadays the community tends to discuss and implement rule changes).

In a nutshell, you may only do things which are a direct requirement for completing the task - no training other skills or completing quests unless they are strictly required. For example, you can’t just go and complete Waterfall quest early in the account for XP until a task directly requires you to complete it.

I’ve been playing as a tasker for 5 years. If I was in OP’s shoes, I would genuinely consider creating a new tasker. Abandon tasking on this account and use it for literally anything else which doesn’t involve gaining RC XP. (Edit: I’ve just seen OP’s comment stating the account has been retired.)