My PC "refuses" to use dedicated GPU...

Context:

I've been searching for a solution to this over like 2 and a half years now. My PC model is an Acer Aspire 5600U, I know it's a little bit on the -older- side, I mean, we purchased it back in 2013, but aside from gaming, for things like school, homework, watching videos, etc, it's still in a very healthy state, so I believe it still has at least a couple years of useful life until we have to inevitably get a newer computer. It has two graphics cards:

-The integrated one, an Intel HD Graphics 4000

-The dedicated one, an NVIDIA GeForce 630M

There was a time, I think 2013-2016, when my PC was able to perfectly run some early 2010's games on low to medium settings, for example, Call of Duty: Black Ops II, Battlefield 3, CS:GO, and some older games like Minecraft and GTA San Andreas. Even by the end of 2016, I downloaded GTA V and, although I had to lower all settings to the minimum, it performed just fine and was playable.

The problem:

Since early 2017, I noticed the computer started to struggle running Black Ops II on the settings that I always used on that game, so I had to start lowering them to be able to play it normally with no lag; not that big of a deal, I don't really care all that much about graphics, I just want a game to be playable, specially if I'm playing online. Same thing happened with CS:GO, and I had to lower all settings on that game aswell. Then, with Minecraft, I noticed a similar trend, and when I pressed F3 to see how the game was performing, I noticed it was using the integrated graphics card (the Intel), instead of the NVIDIA like it had always been (or at least that's what I believe though. Before all this problem started, I never really paid attention to all this stuff).

So, from this time (early 2017) to early 2019, my fix to this was to disable the Intel GPU in the device manager whenever I wanted to play a game, and then launch the game; the performance difference between the Intel and the NVIDIA was very noticeable, and in the case of Minecraft, I was able to confirm (with the F3 menu) that it was indeed using the NVIDIA GPU. Like I said, this was my fix to my initial thoughts of my PC not using the dedicated GPU in "normal" conditions.

However...

After some time, more or less by early 2019, this wasn't working anymore. Now, if I did this, Minecraft and basically every other game were running on an extremely low FPS, I think it wasn't even 1 FPS, it looked more like a PowerPoint Presentation. The odd thing was that Minecraft was still showing that it was using the NVIDIA GPU, but I don't think it was the case because of how horrible the game was performing. Then, when I enabled the Intel GPU back, games were now running not as good as when they were using the NVIDIA properly, but they were definetively not as bad as when I had it disabled.

What I've tried already:

Since then, I've dug the internet looking for a solution to this, and I think I have done almost everything to fix this, but none has worked out apparently. I don't even know where to start:

• I updated both GPUs
• I unistalled and reinstalled both GPUs (from the device manager; since my PC is an all-in-one, I cannot change the GPUs physically)
• Switched the global default GPU in the NVIDIA control panel as well as for each specific program
• Select the "open with graphics processor"-> "high-performance NVIDIA processor" on the right click menu when I try to run a game
• Went to the BIOS, but as far as I can tell, there was no option whatsoever to do something about which GPU to use, or at least not an obvious one.
• In the PC Settings--->Display---> Graphics Settings, I have also changed program by program which GPU will they be using, and a curious thing is that in this section, the NVIDIA GPU doesn't even show up:

In my opinion, this doesn't even makes sense, since the NVIDIA GPU shows perfectly at the device manager, and of course, the NVIDIA Control Panel also shows it:

There's only two possible solutions that I know of that I haven't tried yet, and they are: getting back to an older version, whether be for one or both GPUs, or for the Windows 10 version intself. But at this point, I'm kind of tired and hopeless after two years with this problem.

Now, I suspect this might be a hardware problem, but I'm not too sure about it, because if that was the case, I believe my PC would not even detect the NVIDIA GPU in the device manager.

This is a very frustrating problem, because even though I'm perfectly aware that this isn't a gaming PC, I KNOW it can give a little bit more gaming-wise, and I really think this is the main reason of why it's not as good at running games just like it was at least 4 years ago.

So, I would be very thankful if anybody can help me with this case...

Thanks in advance, if you need any more details about my PC, just ask for them.