was having no problems with WiFi while on vacation until the past couple of days.
When you are on vacation you use Public Wi-Fi.
You are definitely dependent on the local Wi-Fi signal strength.
See this Apple article: Use captive Wi-Fi networks on your iPhone, iPad or iPod touch
Use captive Wi-Fi networks on your iPhone, iPad or iPod touch – Apple Support (UK)
When you are at Home, see the following Apple articles:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support
Recommended settings for Wi-Fi routers and access points
Recommended settings for Wi-Fi routers and access points - Apple Support
If you need help with your Wi‑Fi password
If you need help with your Wi‑Fi password - Apple Support