This might be worth investigating...

Numerous free VST instrument emulations are availble to download.
They can be quite convincing sounding replicas of real world instruments
Normally they are intended for use in software sequencer DAWS

[https://transverseaudio.com/posts/best-free-daws-for-music-sound-design-2019].

But if DAWs are too complex and demanding,
there are also a few free programs that allow these VST instruments
to be installed as standalone instruments
which can be played by Keyboards or other controllers..

[https://www.google.com/search?q=free+vsti+host&oq=free+vsti+host&aqs=chrome..69i57j0l5.4989j1j4&sourceid=chrome&ie=UTF-8]

This might be a bit daunting for beginners,
though they could be encouraged and helped by more experienced mudcatters...

For instance I've started using the free edition of Cantabile Lite - Free VST Host

So far I've loaded in my paid for VST instruments,
and have only scratched the surface of this software's options...

On another less capable PC I'll use it with entirely free VST emulations of classic organs, reed,
and string instruments etc..

Alternatives to Cantabile might be easier for completely inexperienced players
who just want to play midi files through authentic sounding instruments on their computers...

This may be of interest for mudcatters who have so far not considered
such versatile software music tech...