Also, modern OSes are designed to fill as much of your RAM as possible. Windows does it, Android does it; pretty sure Linux and MacOS does too. The number you’re looking at only shows the RAM usage by currently running processes. Unused RAM is wasted RAM, so your OS will fill as much of it as possible with prefetched data so that your machine will be more responsive when you actually need to use the data that was stored in advance for you.
Also, modern OSes are designed to fill as much of your RAM as possible. Windows does it, Android does it; pretty sure Linux and MacOS does too. The number you’re looking at only shows the RAM usage by currently running processes. Unused RAM is wasted RAM, so your OS will fill as much of it as possible with prefetched data so that your machine will be more responsive when you actually need to use the data that was stored in advance for you.