My wife uses Fire Tablets. I gave her the first one (after trying it out as a potential tank mounted GPS device, a use for which it wasn't any good at all).
Ducks and water, it turns out my wife is a natural Fireperson ......
She loves it for consuming Amazon stuff, which she does a lot of. She also wears out the micro USB charging connectors and kills the batteries on a cell phone like frequency and she simply goes and gets another one.
I have inherited the old stuff and have played Joe fix-it on batteries and Joe failed to fix-it on the soldered in place micro USB connectors and Joe can't even try to fix it on the motherboard charging shut off circuits.
I learned a lot about Fire Tablets, and I did a lot of "failed to fix it" in doing so.

We prefer the 8" form factor as it fits in the hand better than anything else we have found.
So, we have two old Apple iPads, three Fires (two working and one dead) and some misc. parts lying around.
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There is a new Fire 8 HD 2020 out now, and it costs $5 more than the old Fire 8 versions cost.
Why is it worth the extra $5 to a normal person ???? * Screen size is still the same, but the bezels are smaller and the top bezel isn't nearly so fat any more.
Yes, this means your old tablet holder thingie won't fit any more ......* Processor and rest of upgraded unit is 30-40% faster (depending on exactly what you are doing).
* Graphics are faster, and there is a lag free Gaming Mode that shuts off all background uses and makes the thing MOVE FASTER while gaming.
* Bigger Battery, life is 12 hours of use instead of a limping 8-10 hours of use.
* Best item saved for last ---- USB C connector for charging !!!!!I am an expert on this one -- all our past Fires died limping deaths with bad batteries and multiple bad cables and tons of different "it won't charge" syndromes.
All of which originated with or started from Amazon's pick of the micro USB port format.
Replacement batteries and new cables can't fix it for more than a week or so before IT'S BACK sticking its ugly face up into yours.
Now, some Free Advice Time.Use the charger that comes with the unit for the longest lasting total trouble free life span on the Battery Life. I like you have more powerful chargers available to me, but the current unit simply isn't rated for 3 Amp Fast Charger use (yet).
A Fire Tablet has a charge level sensing circuit on the motherboard (it shuts down overcharging when full charge is reached) a circuit that gets damaged over time by mis-applying hyper charging plug up type chargers. Right now the largest charger you can safely use at all is a 2.1 amp Apple charger, or surprise surprise, the 1.8 amp stock charger that came in the box with the oldest Fire tablet.
Later on in the lifespan of the battery you may be tempted to hyperdrive the charging a bit to get it to pick up faster, but please, not now while it is newish and still under warranty.
You can damage the unit trying to hyperdrive the charger, I have been there, I have done that and can send you a tee shirt if you want me to (it will only cost you $55-$80 for shipping).
Next, none of the current 1-9 gen FIRE-TWEEKING tool kits were built with this unit in mind as it simply wasn't out there yet. Give them a year to completely catch up with the new Fire 8 HD internal circuit tweeks and various programming changes. 9.1 gen Kits just out may have some of it in there, but not all of it is fully understood, fully cooked and working good yet .....
Yes, I suspect they will eventually have a button or a slider to turn on GAMING MODE LAG FREE SPEED all the time for all uses, it is a thing that just begs to be done ......