upgrading a HP envy pc

[MultimediaLies]

I am looking for advice about upgrading my current computer and I hope someone here can help me.

I have an HP Envy laptop running Windows 11 and I have been using it for about four years. I use this computer for almost everything. I work with programs like Blender and Unity, I sometimes play demanding games, and I also use it for digital drawing with a Wacom tablet. It really is my all in one computer.

Lately I am starting to notice its limits. The battery drains very fast and my storage gets full quickly. I already use an external drive to save space, but it still feels like the system is struggling. Performance is not always great, especially when using heavier software. I also cannot connect my Oculus VR headset because my graphics card is not compatible.

I was wondering if there are ways to upgrade my computer without taking it apart. I do not have any experience with opening or upgrading computers internally. Are there external upgrade options that could help, like an external graphics card or other devices that can improve performance? If external GPUs exist, would they even work with an HP Envy laptop and Windows 11?

If internal upgrades are the only real option, where should I go for that? A computer repair shop, HP service, or another specialist? Is it generally expensive to upgrade a laptop like this, and at what point would it be smarter to just buy a new computer that can handle heavier tasks?

I am very interested in affordable or budget friendly solutions. Even small improvements would help. Are there Windows settings, system optimizations, or software I can remove that might improve performance? Any tips on battery life, memory usage, or graphics performance would be very welcome.

In short, my questions are:
Is it possible to upgrade this laptop externally?
Are external graphics cards a realistic option for my situation?
Would internal upgrades be worth it for a four year old HP Envy?
Where should I go if the laptop needs to be opened?
Are there software or system tweaks that could help performance?
Would it be more cost effective to upgrade or to buy a new computer?

Thank you very much for reading and for any advice you can give.