I'm utterly done with app development for Google

Question

It's been approximately 13 years since my coder friend and I first launched a simple Solitaire/Klondike game on the Android App store. We were among the pioneers in the Android Market at the time, and our initial success was remarkable. Our app garnered thousands of weekly installs and provided us with a decent income through unobtrusive advertisements in the corner of the screen. Our user reviews consistently held at an impressive 4.5 stars.
However, a couple of years down the road, Google implemented a sudden change in the SDK. Unfortunately, my partner and friend had experienced a personal breakdown, moved away, and lost interest in maintaining the app. This left me with the responsibility of finding a way to rebuild and maintain the app on my own. After careful consideration, I decided to migrate it to Unity, despite the associated costs.
I hired a Unity developer to clone the app from its source files. I then invested several weeks of my own time enhancing it, introducing new features, additional card decks, and backgrounds. I was genuinely proud of the result, and after a few months of being offline, I relaunched the app.
To my disappointment, it took months for the app to even appear in search results. During this waiting period, I observed other Klondike apps, some of which were hastily assembled and appeared to be asset-flipped, claim the top spot in search results. One of them hadn't even been altered from the off-the-shelf Klondike app available on the Unity Marketplace; they simply changed the logo and uploaded it to Google Play. This app remained in the #1 spot for months. Meanwhile, my app, which had been on Play for years, accumulated 100k installs and garnered thousands of 4 and 5-star reviews, was nowhere to be found in search results.
My enthusiasm waned. The perplexing algorithm behind app rankings, where a subpar asset-flipped app could easily clinch the #1 spot while my well-crafted, previously successful, and meticulously maintained app remained invisible, left me disheartened. The constant need to republish my app from Unity due to Google's frequent changes, whether related to their Advertising SDK, parental settings, privacy settings, or inexplicable checkboxes, drained my motivation.
(At this point, I should note that I once had about six apps live on Google Play, but as of now, none of them are available.)
To add to the frustration, advertising revenue plummeted. Even when my app was being played as frequently as before, the earnings were meager. Google appeared to have significantly reduced the share of revenue paid to the developers who were essentially generating profits for the platform.
Today, I received yet another email from Google, informing me that my app had been removed due to an outdated SDK. At this point, I've reached a breaking point. The immense effort and financial resources I've invested in this app, and my other apps, hardly seem worth the meager ad revenue, especially considering the constant removal of apps due to Google's seemingly arbitrary code adjustments, forcing me to spend countless hours re-implementing the SDK or revising my Publisher settings, often for trivial changes.
It's disheartening to see how Google, despite its exponential growth in business and revenue, has made it increasingly challenging for small creators like us who supported Android from the beginning. We were the ones who developed apps, bought their phones and tablets, and contributed to its early success. However, over time, Google has continually diminished the rewards for our efforts, making it nearly impossible to sustain a livelihood as independent developers. This has left a sour taste, and I've decided it's time to move on.

Arize Nnonyelu · Accepted Answer

I would like to inform you that algorithms are meant to be dynamic. When they are updated, you don't say that they are faulty. You may need to turn back to standards. 
Here is a link to Google Play Academy https://playacademy.exceedlms.com/. It will give you an insight of the standard practices as adviced by Google Play.
Thank you.