Dealing with Linux Flickering and Disk Space Issues – Need Advice!

I've been exploring various Linux distributions over the past couple of months because my Windows system is too slow for Windows 11. I started with Linux Mint but ran into a screen flickering issue, so I decided to try Ubuntu, Pop!_OS, and Zorin, but the flickering persisted along with connection issues. Eventually, I tried Fedora, which solved the flickering and connection problems, but then my hard drive space started disappearing rapidly – my installation grew to 90GB within a week despite only downloading five additional apps. Recently, I switched to Debian, and while the flickering is gone, the connection issues returned. My laptop is a Dell 7300 with an i7 8th gen processor, Intel graphics, and 16GB of RAM. I've read about Arch but it seems too complex for me. Can anyone provide suggestions to resolve these issues?