There are two categories of methods to improve your 4G/5G signal:

Simple solutions you can try yourself:

Restarting your phone: This resets the connection and can sometimes force your phone to latch onto a stronger signal.

Moving to a different location: Cell signal strength varies depending on your surroundings. Try moving to a spot with fewer obstructions like walls or buildings.

Checking for software updates: Outdated phone software might affect signal reception. Updating your phone's operating system and carrier settings can potentially improve performance.

Advanced solutions (may involve cost):

Signal boosters: These amplify existing weak signals but come with regulations and might require proper setup. Sigal booster is the product to use a donor antenna to pick the signal source from the area, and use the signal booster to amplify it,  after the signal amplify it, the amplified signal will be launched by the installed service antenna.

Upgrading your phone: Newer phone models tend to have better antenna technology and might perform better in weak signal areas.

Important points to remember:

Cellphone signal boosters: While they can amplify signals, the product can not generate the signal, only when there is signal source available in the area, then the product can pick up and amplify it. If there is no any signal in the area, then the product will not work.

Limited effectiveness: Even with approved boosters, results may vary depending on the signal strength in your area. as the mobile signal booster performance is also related with how strength of the signal source, and if there is blocked signal material to prevent the signal from transmitting.