First try to analyse what happened to your revenue stream - did something break in the marketing funnel? New competitors? The problem your app solves doesn't ex

First try to analyse what happened to your revenue stream - did something break in the marketing funnel? New competitors? The problem your app solves doesn't exist anymore? Incompatibility with newer hardware/OS? Once you have the answer to that it will be easier to define possible paths forward. Patreon + blog is a totally different product which will in turn attract (or not) a different market. Another option for monetisation you didn't mention is a subscription plan, which is what many apps do today (Just a few open right now on my computer - Todoist, Notion, Slack, Sketch).