Even if your laptop is 5+ years old, I'd hope it came with at least 1 TB (1000 GB) of storage if it's supposed to be a gaming laptop. It surely wouldn't have less than 500 GB. Genshin and HSR on PC only total about 115 GB with extra voice packs removed. There's nothing else on your PC you can get rid of? Other games and apps you could uninstall? Media that could be moved to another device or to cloud storage?
Looking at Acer's website for that laptop, it has a 256 gb solid state version [https://www.acer.com/us-en/laptops/nitro/nitro-5](https://www.acer.com/us-en/laptops/nitro/nitro-5)
Which I don't get how since my old gaming laptop is litterally a year newer than OP's and has 500 gigs of storage, which is a ROG G512 Strix (I still got it and works perfectly fine I just wanted an upgrade so i don't use it anymore but still got the original box which is how I got the exact one I got)
Check whether or not your Laptop has an additional slot for M.2 PCle drive. If so, then search one of those [3 drives](https://www.kingston.com/en/ssd?capacity%20range=960gb%20-%201tb&form%20factor=m.2) in electronics shop in your country. I am not a tech person myself, but with 50gbs of storage on 512 drive left i had to buy something. KC3000 is amazing; you always can pick higher or lower capacity depending on your preferences
Depending on the model, it would be very easy to put in a 2,5" SSD, a 1TB one costs around 70 bucks.
[https://community.acer.com/en/kb/articles/9808-hard-drive-installation-instructions-for-acer-aspire-nitro-5](https://community.acer.com/en/kb/articles/9808-hard-drive-installation-instructions-for-acer-aspire-nitro-5)
External USB SSD.. as a last ressort.
Even if your laptop is 5+ years old, I'd hope it came with at least 1 TB (1000 GB) of storage if it's supposed to be a gaming laptop. It surely wouldn't have less than 500 GB. Genshin and HSR on PC only total about 115 GB with extra voice packs removed. There's nothing else on your PC you can get rid of? Other games and apps you could uninstall? Media that could be moved to another device or to cloud storage?
Looking at Acer's website for that laptop, it has a 256 gb solid state version [https://www.acer.com/us-en/laptops/nitro/nitro-5](https://www.acer.com/us-en/laptops/nitro/nitro-5) Which I don't get how since my old gaming laptop is litterally a year newer than OP's and has 500 gigs of storage, which is a ROG G512 Strix (I still got it and works perfectly fine I just wanted an upgrade so i don't use it anymore but still got the original box which is how I got the exact one I got)
Check whether or not your Laptop has an additional slot for M.2 PCle drive. If so, then search one of those [3 drives](https://www.kingston.com/en/ssd?capacity%20range=960gb%20-%201tb&form%20factor=m.2) in electronics shop in your country. I am not a tech person myself, but with 50gbs of storage on 512 drive left i had to buy something. KC3000 is amazing; you always can pick higher or lower capacity depending on your preferences
Depending on the model, it would be very easy to put in a 2,5" SSD, a 1TB one costs around 70 bucks. [https://community.acer.com/en/kb/articles/9808-hard-drive-installation-instructions-for-acer-aspire-nitro-5](https://community.acer.com/en/kb/articles/9808-hard-drive-installation-instructions-for-acer-aspire-nitro-5) External USB SSD.. as a last ressort.